This could as well be called a Buick LaCrosse Hybrid, because it employs similar applications through GM's new eAssist technology. A 115-volt lithium ion battery and a 15 kilowatt electric motor help boost fuel economy by 25 percent, when compared to today's four cylinder LaCrosse. That may be interpreted as an estimated 25/37 miles per gallon (9.4/6.35 liters per 100 km, city/highway).
When driving off, initial acceleration is provided by the electric motor which delivers 15 horsepower and 79 lb-ft (107 Nm) of torque. Transition to the gasoline unit uses a torque smoothing function as the engine is turned on, and the eAssist becomes operative again during deceleration, using a fuel shut-off function and regenerative braking, joined with an idle stop system for the 2.4-liter four cylinder gasoline engine.
The gas engine produces a peak power of 182 hp and maximum torque of 172 lb-ft (233 Nm). The wheels are then driven through a GM Hydra-Matic 6T40 six-speed automatic transmission.
The vehicle's drag was significantly improved upon, with help from modified underbody panels and an active front air flow shutter. Real time monitoring is shown on a revised instrument panel that indicates when the LaCrosse is operating in electric mode and an eco-meter for the driver to observe how efficient his or her driving style is.
The eAssist function is offered as standard on all 2012 Buick LaCrosses equipped with the 2.4-liter inline four cylinder engine, with prices estimated at US $30,000.