Cadillac has announced the CT6 plug-in-hybrid version of its newly reveled flagship as expected in Shangahi.

According to the automaker, the new four-cylinder turbo-based PHEV system is projected to more than double the fuel economy of its conventional powertrain siblings.

“The first-ever CT6 is a technological showcase throughout, making it an ideal platform for Cadillac to offer its first plug-in hybrid,” said Cadillac President Johan de Nysschen. “In the CT6, Cadillac presents a new formula for prestige luxury. The advanced plug-in hybrid system is a key addition, providing a combination of exceptional fuel economy, crisp acceleration and strong electric-driving range.”

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Cadillac added the CT6 plug-in hybrid powertrain has been designed to offer enough EV mode range for most daily commutes to be done purely on electric power. It does not spell out what this all-important range will be, but note the pack size is more than double the 8.7-kwh pack in a Mercedes S 500 PHEV.

Specifically, GM engineers have installed an 18.4 kilowatt-hour lithium-ion battery pack between the rear seat and the trunk. This battery system is said to be comprised of 192 prismatic pouch cells, which use the latest generation cell chemistry found in the Chevy Volt.

Not surprisingly, the CT6 PHEV battery will use the company’s active thermal control system that maintains electric range over the battery system’s life.

These batteries will propel an all-new rear wheel electric variable transmission (EVT) combining two electric motors also three planetary gears. This is combined to a 2.0 liter turbocharged 4-cylinder engine with spark-ignited direct injection and variable valve technology for a total system power of 335 horsepower and 432 pound-feet of torque.

Reminiscent of the Volt, the system will allow drivers to select between three distinct operating modes: Normal, Sport and Hold.

Normal: For everyday commuting; provides ideal balance of comfort, performance and maximized EV range and fuel economy.

Sport: More aggressive pedal mapping for improved off-the-line feel and a stiffer steering response.

Hold: Turns car to gas-mode to spare battery. This reserves remaining battery charge for later use.

Full details on the CT6 PHEV efficiency in the U.S. and other markets outside China will be released closer to the car’s introduction in those markets, said Cadillac, but it expects the fuel economy of the CT6 PHEV to be more than double that of the car’s conventional engine offerings.

Like many other PHEV vehicles, the CT6 PHEV will feature regenerative braking using Cadillac’s iBooster and Electronic Stability Program tailored for hybrid electric vehicle regenerative blended braking.

The company explained the iBooster and ESP-hev technology balance the use of the CT6 electric motors to act as generators to slow the vehicle and capture as much kinetic energy as possible during low-demand scenarios, while blending the traditional hydraulic brakes with the motors in high-demand scenarios.