From Buick press:
The LaCrosse offers a great design, all-wheel drive, a suite of advanced personal technologies and safety features, and a choice of two fuel-saving powertrains. A fuel-efficient, direct injected Ecotec 2.4L four-cylinder engine is the standard engine in CX and CXL FWD models (it was added to the lineup in mid-2010 on CX).
Backed by a fuel-saving six-speed automatic transmission, the Ecotec 2.4L powertrain delivers an EPA-rated 30 mpg on the highway and 19 mpg in the city – making LaCrosse one of the most fuel-efficient cars in its segment. Buick expects about 25 percent of LaCrosse customers will opt for the engine.
The Ecotec 2.4L diversifies the LaCrosse’s powertrain lineup, which also includes a 3.6L V-6 with variable valve timing and direct injection; it is rated at 280 horsepower (209 kW) and 259 lb.-ft. of torque (351 Nm). AWD is available on 3.6L-equipped models.