Chevrolet announced stop/start technology will be standard on the 2015 Impala powered by the 2.5-liter ECOTEC engine.
The GM brand said this addition improves the vehicle’s city fuel economy by nearly 5 percent, or one mile per gallon.
For the 2015 model year, the Impala will be available with two powertrains, a standard 2.5-liter engine with stop/start, and a premium 3.6-liter six-cylinder engine.
The 2.5-liter Impala with stop/start yields an EPA-estimated fuel economy of 22 mpg city, 31 for the highway and 25 combined, according to Chevrolet. The Impala with the 3.6L V-6 engine will not include stop/start technology.
The Impala comes standard with a four-cylinder engine and Chevrolet stated this configuration currently accounts for more than 30 percent of Impala retail sales.
Chevrolet explained stop/start shuts down the engine in certain driving conditions to reduce fuel consumption. The technology is becoming more prevalent worldwide.
A recent report from Navigant Research predicted worldwide sales of vehicles with stop/start technology will grow from 8.8 million in 2013 to 55.4 million in 2022.
The Impala becomes the second vehicle in Chevrolet’s U.S. lineup to feature stop/start technology, following the 2014 Malibu introduced late last year. Chevrolet said the technology helps improve the Malibu’s city fuel economy by 14 percent.
Chevrolet added its engineers developed the stop/start in the Impala based on their experience with GM’s eAssist system and the accompanying algorithms that allow engines to engage and disengage subtly.
“Stop/start system customer research indicates they want the engine to start up as quickly and smoothly as possible after a stop,” said Mark Meyers, Chevrolet Global Vehicle Performance manager.
Per the company, a noise and vibration team worked closely with drivetrain engineers to revise motor mounts to provide the greatest isolation possible from the cabin. Additionally, the team included a larger heavy-duty starter motor to assist with the additional ignition cycles.
The 2015 Impala goes on sale this summer with a suggested starting price of $27,735 for the 4-cylinder LS model, and $30,960 for the 6-cylinder LT model. These prices include an $825 destination charge, but exclude tax, title, license and dealer fees.