General Motors announced today a global strategy to deliver a new generation of connected cars and trucks with embedded 4G LTE mobile broadband. Per GM, this is the largest deployment in the automotive industry to date.

The first GM cars, trucks and crossovers to get 4G LTE will be most 2015 Chevrolet, Buick, GMC and Cadillac models available in 2014 in the United States and Canada.

4G LTE services will originally be delivered through AT&T. GM said it will announce more carrier and supplier relationships in coming months to expand 4G LTE capabilities in markets around the globe.

According to GM, expected benefits for customers could include in-vehicle Wi-Fi hot spots, new infotainment options like streaming video entertainment in the back seat, real-time updates and faster application downloads. These enhancements build on OnStar’s existing portfolio of built-in connected services, first introduced in GM vehicles in 1996.

The built-in 4G LTE structure GM is opting to go with is specifically designed for in-vehicle use as it is integrated into the vehicle’s electrical system and includes an external antenna to maximize coverage and connectivity.

GM specified that customers will not be required to have a smartphone to use the integrated connected services.

“In addition to allowing consumers to bring in and connect to personal mobile devices, the vehicle will also act as its own mobile device, enabling embedded vehicle capabilities,” said Mary Chan, president, Global Connected Consumer, General Motors.  “Turning this vision into a reality starts with enabling fast, reliable and responsive connectivity within the vehicle.  Through this built-in 4G LTE connection we have the opportunity to reinvent the mobile experience inside a vehicle.”

According to GM, applications of widespread in-vehicle 4G LTE connectivity will enable vehicles to interact directly with their environment to enhance safety, efficiency and convenience for drivers and passengers. 4G LTE will make services such as real-time traffic and navigation updates possible, pulling information from the cloud.

GM and AT&T said they will also work together on a broad ecosystem focused on developing new communication applications to enhance the driving and riding experience.

“While our 4G LTE network will provide fast, reliable mobile broadband for GM’s connected vehicles, we’re also looking forward to working directly with GM researchers and engineers as well as the developer community to invent new in-vehicle applications that will take full advantage of our powerful network,” said Ralph de la Vega, president and CEO, AT&T Mobility.

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Today, pickup sales are overwhelmingly slanted toward buyers who truly need them; those in the building trades, service industries and agriculture. To meet the needs of buyers, the Sierra Hybrid trumpets the critical stats for full-size pickups. It can tow up to 6,100 pounds and still deliver 20 mpg city/23 highway and 21 combined. The Sierra Hybrid’s city fuel economy rating is better than a compact four-cylinder powered Toyota Tacoma, which can tow only 3,500 pounds.

For 2013, GMC continues to offer the Sierra Hybrid truck in just one body style, a four-door crew cab with a short box. Two trim levels are offered, 3HA and 3HB, and a choice of either two- or four-wheel drive. There are no significant changes for the 2013 model year.

Hybrid Powertrain

It’s no surprise that the Sierra shares the same hybrid system found in the Chevrolet Silverado, since both are built on the same platform and feature the same drivetrain. The hybrid hardware combines a tweaked 6.0-liter 332 horsepower V8 gasoline engine, a 300-volt nickel-metal hydride battery pack and a two-mode hybrid transmission, referred to at GM as an electrically variable transmission (EVT). The transmission houses two 60-kilowatt (89 horsepower) electric motor/generators along with three different planetary gearsets and four traditional clutches.

Essentially a combination of a traditional automatic transmission and a continuously variable one (CVT), EVT has two drive modes – hence the name “two-mode hybrid.” City driving – mode one – is where the hybrid powertrain gains the most fuel economy. During stop-and-go and city drives, the Sierra Hybrid can operate with electric power only, gas engine power only or a combination of both. Like other hybrids, the Sierra shuts the engine off when the vehicle stops, and when it’s time to go, the electric motors propel the big SUV to around 30 mph for a couple of miles. Regenerative braking recharges the battery pack located under the rear bench seat.

In the second mode, the 332 horsepower 6.0-liter V8 engine is the primary source of motivation, and one or both electric motors can run concurrently along with the engine in order to provide a power boost. If the Sierra is pulling a load, the transmission locks out the electrically variable gears and both electric motors. It shifts over to the four fixed gears, so the V8 is the sole source of power. A computer monitors the entire system and determines every 1/100th of a second what method is the most efficient means to propel the vehicle.

The EVT is a marvel in packaging. Engineers somehow crammed all of the hardware, including the electric motors, in the same space as the truck’s six-speed automatic transmission. Also, the EVT was designed to bolt directly to the standard four-wheel-drive transfer case found on the gasoline-only models, giving the hybrid true four-wheel-drive credentials.

The crux of the Sierra Hybrid’s powertrain is the V8 engine with cylinder deactivation technology – four of the eight cylinders take a break during light-load cruising when additional power is not needed. Camshaft phasing, and late-intake valve closure allows even more efficient engine operation.

Other fuel economy tricks include low-rolling-resistance tires, an electrically driven power steering that contributes about 0.5 mpg and a standard tonneau cover on the cargo bed, for better aerodynamics – cloth on the regular model, a three-piece hard shell if you get the luxury trim.

Styling, Cabin And Features

Overall styling of the 2013 Sierra is handsome, despite being around since model-year 2007. It’s a conservative design that relies on the power of the rectangle, emphasized by the big, squared-off chrome grille with big, red squared-off GMC letters. Flanking the grille are stacked, jeweled lens headlights. Slightly bulging elongated fender flares sweep behind the headlights.

Sierra’s hood has a pair of long, narrow V-shaped power bulges that lead back to a steeply raked windshield for improved aerodynamics resulting in enhanced highway fuel economy. Small hybrid badges on the front fenders are the only visual differences between the Hybrid and a gasoline Sierra.

The 2013 Sierra Hybrid’s cabin treats its passengers with roomy seats that are large, supportive and conducive to long periods in the saddle. In the base 3HA that’s a cloth covered 40/20/40 split bench seat up front that is power height adjustable for the driver. Combined with the rear bench, this configuration can seat up to six. Grab the premium 3HB and you’ll find comfortable leather bucket seats for the driver and the front companion. Regardless of model choices, this is a crew cab and there’s enough head, should and leg room that even with six people there’s a feeling of spaciousness.

The dashboard is simple with large controls – from the door handles to the radio and climate control knobs, most can be operated wearing work gloves. It’s a basic design, but logical and pleasant. A bonus is a large double glove box and lockable storage bin, big enough for a laptop (with its own 12-volt power outlet), built into the split front bench seat.

3HA models are standard equipped with keyless entry, heated mirrors, full power accessories, cruise control, dual-zone automatic climate control, a tilt-only leather-wrapped steering wheel, Bluetooth, a six-speaker audio system with a CD player, an auxiliary audio jack, satellite radio and GM’s OnStar emergency communications.

Stepping up to the 3HB adds power folding outside mirrors, rear parking sensors, power-adjustable pedals, leather upholstery, six-way power front bucket seats, a rearview camera, a Bose sound system, and a navigation system with a touchscreen interface and real-time traffic.

All models are equipped with StabiliTrak electronic stability control system, a locking rear axle and a trailering package. They also include standard dual-stage frontal air bags, head curtain side air bags and seat-mounted side impact air bags.

On The Road

GM’s press introduction of their two-mode hybrid pickups included both the GMC Sierra Hybrid and Chevy’s Silverado Hybrid. I spent equal time in both trucks and since then have driven the 2WD and 4WD Silverado Hybrids for hundreds of miles and both trucks returned fuel economy numbers at, or slightly above, the EPA estimates. I would expect similar performance from the Sierra Hybrid.

I found that accelerating from a stop rather briskly, and then easing off the accelerator to allow the electric motors to take over, gave us the most distance in electric-only drive up to around 30 mph. Same procedure works for implementing the V-4 operation of the engine – at around 40 mph, smoothly boost speed and then ease off. Of course when power acceleration is really needed, a quick, firm push on the accelerator unleashes the V8’s 332 horsepower and 367 pounds-feet of torque plus, assist from the electric motors.

Overall, the dual-mode system performs like GMC’s conventional pickup powertrain and is mostly transparent. It does add around 450 pounds of weight and delivers less towing and hauling capability, but it rides, handles, steers, brakes and goes about its daily business as well as any congenital Sierra.

Economics

If you are dead set on buying a hybrid pickup there are only two choices, the GMC Sierra Hybrid and its near twin Chevrolet Silverado Hybrid. Even though the Sierra is the more upscale of the two with more standard content, it is only around $400 more than the Silverado. The somewhat Spartan 3HA 2WD has a sticker price of $40,310; the 4WD is priced at $43,710. For a luxurious interior environment, the 3HB 2WD starts at $47,090 and jumps to $50,490 with 4WD. Both trim levels have a high content of standard features, and the hybrid powertrain adds roughly $3,500 to a comparable Sierra non-hybrid pickup, which returns just 15 mpg city/21 mpg highway and a combined 17 mpg.

Since a crew cab is the Sierra Hybrid’s only body style, appeal is somewhat limited. And, those needing either a longer bed or more than the 6,100 pound towing capacity, a regular Sierra or another brand may be the best option. If fuel economy and more towing/hauling capabilities are needed, Ford’s F-150 with the V6 EcoBoost engine is rated at 16 city/22 highway/18 combined and can tow 11,300 pounds. Comparably equipped, the F-150 starts close to $39,000.

When comparing the Sierra Hybrid’s price with other trucks, whether they’re GMCs or other brands, it’s important to look at the features, not just the base price. Both trim levels have an abundance of standard features and comparably equipped competitors will be close in price. So, if a pickup priced in the $40,000 to $45,000 range is what you are looking for, the Sierra Hybrid is worth a look. Plus, with oil climbing above $100 a barrel (again) and gas prices surging past $4 per gallon on their way to who knows where, spending a few thousand dollars to gain five or more mpg will seem like a very shrewd purchase.

What’s Next For The Sierra Hybrid?

General Motors’ had planned an all-new full-size pickup truck lineup including the Sierra Hybrid for the 2013 model year, but put off production as it worked its way through bankruptcy. A redesigned, re-engineered Sierra line is expected to debut as a 2014 model at the 2013 North American International Auto Show in January or 2013 Chicago Auto Show in February, with production beginning next October.

The big question is, will a Sierra Hybrid – or any of its sibling hybrid models – be included in the redesign? At this writing, it appears the answer is no.

We’ve reported that four sources told GM Inside News recently this was the case – but this news has not yet been confirmed by General Motors. The sources, believed to be reliable, said GM will discontinue development of its next-generation hybrid light trucks including the GMC Sierra and Yukon and Chevrolet Silverado and Tahoe. There is a possibility the Cadillac Escalade Hybrid may be carried forward, but it appears they may all be canceled unless GM says otherwise.

Should the Sierra Hybrid, and its corporate cousins, make an appearance as a 2014 model, fuel economy gains will come from weight reduction, a smaller displacement V8 engine, upgrading the battery to a lithium-ion pack, revised electric motors and possibly, an all-new four-mode electrically variable transmission.

Prices are Manufacturer Suggested Retail Price (MSRP) at time of publication and do not include destination charges, taxes or licensing.

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In 2008, the GMC Yukon Hybrid, and its counterpart the Chevrolet Tahoe Hybrid were the first vehicles to utilize the advanced two-mode hybrid powertrain developed jointly by General Motors, BMW and the then DaimlerChrysler. These full-size sport-utility vehicles launched a new breed of larger people carriers that were significantly greener than their gas-powered versions.

How much greener? Well, we’re not talking hybrid car fuel economy numbers, but the two-mode technology results in a 25-percent improvement in overall fuel economy over the Yukon hybrid’s gas-powered counterpart. More impressive is a 40-percent improvement in city driving. Both the Yukon Hybrid two- and four-wheel drive models have an EPA rating of 20 city/23 highway/21 combined as compared to the conventional Yukon’s 14/18/16 with the 6.2-liter V-8. Unbelievably, this huge SUV’s city fuel economy is 3 mpg better than a Honda Accord coupe with a 3.5-liter V-6 engine and manual transmission.

Automobile Magazine gave the Yukon Hybrid high praise, stating, “We’ve professed our admiration for GM’s two-mode system before, even going so far as to name it our Technology of the Year in 2008. There’s no doubt that it’s a boon for those who seriously need a full-size vehicle–it helps allow an automobile that can seat the Brady Bunch, pull a boat, and return some impressive fuel-economy numbers while driving around town.”

Available with either two- or four-wheel drive, there are two trim levels available. The standard 2013 Yukon Hybrid has a starting price of $52,820 for the 2WD model, $55,630 for the 4WD. The lavishly appointed Yukon Denali Hybrid 2WD starts at $60,635, the 4WD at $63,480. All prices are a $350 increase over the outgoing models, and there are no significant changes for the model-year 2013.

Hybrid Powertrain Details

GM’s electrically variable transmission (EVT) and 300-volt nickel-metal hydride battery pack work with the standard 6.0-liter V-8 gasoline engine to enable the Yukon Hybrid’s efficient performance. Most of the fuel economy gains come from the (EVT). The transmission is made up of two 60-kilowatt electric motors, three planetary gearsets and four fixed gears that use the same space as GM’s six-speed automatic transmission.

In order to keep the vehicle running at peak efficiency, this hybrid system is able to run in one of two separate modes – hence the name “two-mode hybrid.” For low-speed, low-impact driving, the powertrain works just like other hybrids; during stop-and-go and city drives, the Yukon can operate with electric power only, gas engine power only or a combination of both. Additionally, the engine shuts off when the vehicle stops, and when its time to go, the electric motors propel the big SUV to around 30 mph for a couple of miles.

The second mode is mostly for highway driving, at which time one or both electric motors can run concurrently along with the V8 engine in order to provide a power boost. The two-mode transmission is the key to the whole system, which attempts to keep the engine running at the optimum rpm for low fuel consumption. Essentially, it manages a balancing act between the engine and the electric motors. It is also responsible for making the transitions between the two modes practically seamless.

The gasoline engine also plays a role in fuel efficiency. For starters, engineers adapted the V8 to operate with late intake valve closing (Atkinson-cycle combustion process) for fuel economy gains. The engine also features cylinder deactivation technology. In other words, this engine can shut down four of its eight cylinders when additional power is not needed – a big fuel saver on the highway.

Despite its focus on fuel-efficiency, the Yukon Hybrid still delivers all the power and capability needed from a full-size SUV. It boasts 332 horsepower, and the 2WD model can tow up to 6,200 pounds, 6,000 pounds for 4-WD versions. If you need it, the four-wheel drive system is comparable to most trail-rated pickup trucks, allowing the Yukon to drive off-road or through difficult road conditions with excellent traction and stability.

Exterior And Interior

Now in its fifth year, the GMC Yukon Hybrid remains a handsome vehicle, with pleasing proportions and a minimum of unnecessary adornment. Slight exterior changes make the hybrid version more aerodynamic compared with the conventional Yukon. A redesigned bumper eliminates the regular Yukon’s fog lights for some corpulent bodywork, including a wider front air dam that moves more air underneath. Also, roof rack rails are eliminated for reduced drag, runningboards are tapered front and rear to decrease wind resistance and the body shape was given sharper cuts to hold air while an extended rear spoiler contributes to the vehicle’s overall aerodynamic performance. The final touch is aero-efficient 18-inch cast aluminum wheels.

The Denali hybrid version is identifiable by its signature chrome honeycomb grille, monochromatic exterior appointments and 22-inch chrome wheels. Interesting that the Denali is missing the functional cosmetic changes made to the regular Yukon Hybrid yet, has the same fuel economy ratings.

When introduced, the Yukon Hybrid’s cabin set the standard with a straightforward design accompanied by quality materials and craftsmanship. But five years later, competitors have upped the ante. That aside, the list of standard features is quite long including: tri-zone automatic climate control; 12-way power adjustable, heated front bucket seats; Bose sound system; CD/MP3 player; Bluetooth connectivity; navigation system; and power-adjustable pedals. Stepping up to the Yukon Denali Hybrid adds GM’s Magnetic Ride Control, a power liftgate, steering wheel mounted audio controls, heated second row seats and side blind-zone alert.

Behind the 50/50-split third-row seats is a meager 16.3 cubic feet of cargo space. This opens up to 60.3 cubic feet with the third-row seats folded, but they don’t fold flat like some other SUVs. To achieve a flat cargo surface, the third row seats need to be removed, and they each weigh 50 pounds.

Driving Impressions

From a stop, the electric drive can power the Yukon Hybrid up to about 30 mph for a couple of miles or so before the gas engine takes over. The transition from electric to gas power is silky smooth and once underway the ride comfort is exceptionally good for a vehicle this size. Steering feel is on the mark, and while body roll is present during an aggressive turn, it’s less than you would expect from a three-ton vehicle.

I’m impressed with the cylinder deactivation as a tool for increasing fuel economy. With a little practice, the big V8 can be coaxed into operating on four cylinders at around 40 mph, and can do so for several miles. On the Interstate it’s not difficult to maintain four-cylinder operation at 70 mph.

The Hybrid SUV For You?

If you are dead set on buying a full-size hybrid SUV there are only three choices, the GMC Yukon Hybrid and its corporate siblings, the Chevrolet Tahoe Hybrid and the Cadillac Escalade Hybrid. Chevy’s Tahoe Hybrid is only a few hundreds less but it’s styling is more pedestrian than the Yukon’s and the base model isn’t as well appointed. On the other end, the Escalade Hybrid is more tech heavy, more luxurious with tons of bling, however, it’s 20 grand more than the Yukon.

What the Yukon Hybrid offers is plenty of capability for work-related endeavors, hefty towing capabilities and an abundance of space and amenities for large families, even up to eight. Oh, then there’s also the 20 city/23 highway/21 combined fuel economy numbers.

What’s Next For The Yukon Hybrid?

There may not be a next GMC Yukon Hybrid. Apparently General Motors is leaning towards canceling possibly all of the hybrid variants of the new trucks and SUVs that are scheduled to debut as 2014 models at the 2013 North American International Auto Show in January or 2013 Chicago Auto Show in February. Since their introduction in 2008, two-mode hybrid SUV and truck versions have not sold well plus, it’s been reported that the 2014 hybrid development program has experienced cost overruns that has displeased management.

However, a cast-in-concrete decision has not been made and, indeed, it is possible that an all-new 2014 Yukon Hybrid could make its appearance at one of the auto shows. If so, it will continue to be built upon GM’s full-size truck platform, including a live rear axle for towing, and will not switch to a crossover design. Fuel economy gains will come from weight reduction, a smaller displacement V8 engine, upgrading the battery to a lithium-ion pack, revised electric motors and possibly, an all-new four-mode electrically variable transmission.

Prices are Manufacturer Suggested Retail Price (MSRP) at time of publication and do not include destination charges, taxes or licensing.

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Today General Motors said its Chevrolet and GMC dual-fuel extended-cab pickups will retail for $11,000 above comparable Silverado and Sierra HD 2500 three-quarter-ton models.

The trucks, powered by 6.0-liter Vortec V8 engines are able to run on gasoline or compressed natural gas. Although the latter requires a separate fuel tank, GM says the Type 3 unit employed on the Silverado and Sierra HD bi-fuel models is a lightweight unit designed to maximize cargo space and payload capacity, resulting in better bed volume than rival pickups.

Both trucks are available in 4×2 and 4×4 configurations, meet all EPA and CARB emissions requirements and will come with GM’s standard three-year 36,000-mile bumper-to-bumper and five-year 100,000-mile powertrain warranties.

While compressed natural gas vehicles have long been utilized by some commercial fleets notably large taxi companies, until recently it was rare to find CNG vehicles in use by others such as car rental agencies and small businesses or contractors.

However, with higher fuel prices and economic realities, that’s starting to change, as CNG offers numerous benefits for fleets, such as good availability and low price. According to GM’s Commercial Product and Specialty Vehicle director Joyce Mattman, unit costs are around half that of gasoline – presently averaging around $1.89 per gallon – and can be adapted to existing vehicle technology without huge investment.

GM’s new HD bi-Fuel trucks are built at the Ft. Wayne, Indiana truck plant alongside other HD models and then shipped to a Tier 1 supplier for installation of the CNG fuel tank and system components.

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Not exactly a technological lightweight itself, BMW is in talks with General Motors about partnering on future tech research and development, including for fuel cell powertrains.

BMW’s CEO Norbert Reithofer said at the Geneva Motor Show today that he “can imagine” sharing the workload with GM, and BMW has said it may also work with PSA Peugeot Citroen to develop gasoline engines beyond an existing contract it already has with PSA through 2015.

Recently GM bought a 7-percent share of PSA to build on technologies and augment sales. Peugeot has several other partners with which it develops technologies around the world, and BMW could be next to further build on that strategy as well.

What other technologies BMW could collaborate with GM and its new partner – such as electrified vehicles – remains to be seen. As automakers look at looming emissions and fuel efficiency deadlines requiring technological innovation, we expect to see more such alliances, not to mention occasional hiring away of top-gun talent.

Last April BMW hired German native Frank Weber, the GM engineer who helped lead development of the Volt and who is presently working for BMW at a high level on its electrified vehicle program.

Having attracted at least one of GM’s most innovative engineers knowledgeable of significant intellectual capital, BMW could now could continue to share knowledge and costs with GM which has completed extensive work already on electrified and hydrogen technologies, among others.

AutoGuide, GM Volt

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So GM made sure the first pickup trucks that use its Two-Mode Hybrid system would be fully as capable as their non-hybrid brethren. The 2WD versions of the 2009 Chevrolet Silverado Hybrid—and its all-but-identical twin, the 2009 GMC Sierra Hybrid—proudly trumpet the crucial stats for full-size pickups. They can tow up to 6,100 pounds and still deliver 21 mpg (city) / 22 mpg (highway). Each of the trucks started to reach dealers in early 2009.

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2009 Chevrolet Silverado Hybrid.

Pricing for a 2009 Chevrolet Silverado 1500 2WD Crew Cab Hybrid starts at $38,995; adding the luxury package takes it up to $44,155. A 2009 GMC Sierrra 4WD Hybrid in the high-line model runs $47,675.

At a February launch in San Antonio, Texas, GM offered an array of hybrid pickups. HybridCars.com also had the choice of towing a 5,400-pound SeaRay powerboat on its trailer, or a horse trailer with 5,100 pounds of ballast. Until now, no hybrid on earth could handle those loads—and no standard pickup capable of towing either could return more than 20 miles per gallon.

Fuel Economy and Payback

Of course, 22 mpg may still seem profligate to your average Toyota Prius driver. And it takes careful explanation to make the case that a truck this big helps cut US oil imports.

But let’s look at the math. GM says the hybrid powertrain adds roughly $3,000 to a comparable non-hybrid pickup, which returns just 14 mpg / 20 mpg. Racking up 10,000 miles a year, split equally between city and highway travel, the hybrid system saves about 140 gallons of gasoline annually. That’s more fuel than you would save by jumping from a Toyota Camry to a Camry Hybrid—although not quite as big a savings as switching from that conventional Camry to a Prius.

Currently, buyers are eligible for a $2,200 federal tax credit. That means the payback, using $2/gallon gasoline, is somewhere around four years—at least until GM’s credits expire (as those for Toyota and Honda already have; Ford credits are all but gone too). Spending more time in stop-and-go traffic, or racking up higher mileage, cuts the payback time. And if gasoline should return to the $4/gallon levels of summer 2008, payback would speed up even further.

Equipment

At least for now, the hybrid pickup is offered only as a four-door Crew Cab (GM’s most popular body style, with roughly a 45-percent share of sales). The engine is a 6.0-liter V8 that shuts off four of its eight cylinders under light loads. The standard trim level includes “pure American pickup” seating, a.k.a. a front bench seat; a luxury package adds goodies like leather bucket seats to make truck travel that much more comfortable.

You can choose 2WD or 4WD; the heavier 4WD system reduces both towing ability (5,900 pounds) and mileage (20 city / 20 highway). Buyers can opt for a few options, including a sunroof.

2009 GMC Sierra Hybrid.

The hybrid pickups have a few unique exterior features to set them apart from standard pickups. Most noticeable are the polished 18-inch wheels, which save weight, and the standard tonneau cover for better aerodynamics—cloth on regular models, a three-piece hard shell if you get luxury trim. The front air dam extends 11 mm further toward to the road. And GM’s characteristic chrome hybrid-logo-with-green-leaf is mounted on each front fender and the tailgate.

Under the skin, however, these trucks fit a 1.8-kilowatt-hour battery pack beneath the rear seat, and the Two-Mode Hybrid transmission replaces the standard truck automatic. To offset the added weight, the front lower control arms and differential shaft are made of aluminum. And GM engineered a special hydraulic bushing to attach the cab to the frame, damping new vibrations created by adding the 300-pound battery pack.

Driving Impressions

Anyone familiar with pickups of the 1970s and 1980s will appreciate just how refined these trucks have become. The crew cab model drives less like a truck and more like a full-size SUV, though its vertical rear window offers far better visibility.

Ride quality is good; only certain bumps and surfaces betray the solid rear axle. Everything felt solidly bolted together, and we heard no squeaks or rattles at all. At speed, wind noise was apparent, but tolerable.

Unlike GM’s full-size SUVs built from the same architecture, the pickups have a simple dashboard with larger controls. From the door handles to the radio knob, most can be operated wearing work gloves. It’s a basic design, but logical and pleasant enough.

These are large trucks, and tall. In many areas, as with full-size SUVs, traffic ahead often moves aside as the pickup looms in the rearview mirror. In Texas, though, every other vehicle seems to be a full-size pickup, so the Silverado Hybrid attracted zero attention—even in gleaming black paint with bright chrome wheels.

One complaint applies to all of GM’s other Two-Mode Hybrids: The “efficiency gauge” is confusing. It’s not immediately obvious what its unmarked green bar indicates, so it’s not clear whether drivers are supposed to keep the needle to the right or the left. As it turns out, the aim is to keep the needle centered. Too far to the right means you’re sucking gasoline, but too far to the left means you’ve exceeded the regenerative braking capacity and are wasting energy by using the friction brakes. Colors, symbols, or pictograms could go a long way here.

2009 Chevrolet Silverado Hybrid.

During driving, the engine switched itself off and on seamlessly, with the electronic control system providing a smooth flow of power from any combination of battery and engine. We didn’t get much more than 20 miles per hour on electric power, but the truck’s most impressive feat by far was towing that boat uphill—on electricity alone—for almost a minute.

GM has worked hard to improve the algorithms for its brake blending, and stopping was smoother than in earlier Two-Modes we’ve driven. Neither driver nor passengers noticed when the disc brakes kicked in on top of the regeneration.

Summary

True to the ratings, we measured 21.2 miles per gallon over a mixed 20-mile course of city and freeway driving. Our trailer towing was confined to a large loop around hotel grounds, so we didn’t measure mileage, but we’re confident it would be higher than the standard pickup’s.

If you need a full-size pickup truck, but want to use as little gasoline as possible, GM has built what may be the roughest, toughest hybrid this side of a transit bus. As long as the tax credits last, the payback period’s not bad, and if you’re OK with a crew-cab body, you won’t have to compromise any truck functionality. GM says pickup drivers are its most price-sensitive buyers, so the company thinks most hybrid pickups will be bought by fleets or other users whose duty cycles will keep the payback as short as possible.

Note: The Two-Mode transmission system jointly developed by GM, Chrysler, Daimler, and BMW is also used in the Chevrolet Tahoe Hybrid (and its twin the GMC Yukon Hybrid), as well as the luxurious Cadillac Escalade Hybrid. Later this year, it will launch in the BMW X6 Hybrid and a future Mercedes-Benz ML450 Hybrid sport utility as well.

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The new 2009 GMC Sierra Hybrid, which goes on sale in late 2008, is yet another production application of General Motors’ full hybrid system. It achieves 40 percent greater city fuel economy, and a 25 percent improvement in overall fuel economy, compared to its gas-powered counterpart. It also grants a hefty 6,100-pounds of towing capacity—decent but still a far cry from the standard GMC Sierra’s 10,500 pounds of hauling power.

The Sierra Hybrid will be offered in the Crew Cab body style on both two-wheel drive and four-wheel drive models. GMC is claiming that the hybrid pickup can stay in all-electric mode up to 30 miles per hour, drawing energy from its 300-volt battery pack. Gas power comes from a 6.0-litre V8 outfitted with “Active Fuel Management Technology,” which allows the vehicle to shut down four of its available eight cylinders in lighter duty driving. Prices have not been announced.

The Denali XT is the first time GM has placed its two-mode hybrid system in a vehicle capable running on an 85 percent blend of ethanol. Power will come from a new, downsized, 4.9-liter version of GM’s small-block V8. The truck also features cylinder deactivation for further fuel reduction. The carmaker is promising a 50 percent improvement in fuel economy over production pick-up trucks of similar size.

The Denali XT is driven by all-electric propulsion at low speeds, but offers plenty of highway and towing performance from its fixed-gear configuration. It has an estimated payload capacity of 1,100 pounds and a towing capacity of 3,500 pounds.

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