Think of this as a Buick LaCrosse Hybrid. General Motors’ new eAssist technology employs a 115-volt lithium-ion battery and 15-kilowatt electric motor to increase fuel economy by 25 percent compared to today’s four-cylinder LaCrosse. This means the Buick sedan will achieve an estimated 25/37 miles per gallon (city/highway).
During initial acceleration, the electric motor delivers 15 horsepower and 79 pound-feet of torque to get the LaCrosse moving. A torque-smoothing function is activated as the gasoline engine is turned on, and the eAssist system kicks back on during deceleration, using a fuel shut-off feature and regenerative braking, combined with a start/stop system for the 2.4-liter gasoline engine. At full tilt, the gas engine produces 182 hp and 172 lb-ft of twist to keep things moving along at speed, and is mated to GM’s Hydra-Matic 6T40 six-speed automatic transmission.