The 2011 Buick LaCrosse is a 4-door, 5-passenger luxury sedan, available in 4 trims, ranging from the CX to the CXS. The 2011 Buick LaCrosse is equipped with a standard 2.4-liter, I4, 182-horsepower engine that achieves 19-mpg in the city and 30-mpg on the highway. The CXS is equipped with a standard 3.6-liter, V6, 280-horsepower engine that achieves 17-mpg in the city and 27-mpg on the highway. A 6-speed automatic transmission with overdrive is standard on both trims.The 2011 Buick LaCrosse hits new levels of style, sophistication, and driving engagement without alienating the brand's comfort-oriented customer base.The cabin of the 2011 Buick LaCrosse is very accommodating for five, and can even fit three adults across in back thanks to its width, and there's adequate legroom for all.In TheCarConnection's drive tests, the 17-inch-equipped models rode noticeably more comfortably and quietly than the 18- or 19-inch models, where stiffer sidewalls transmitted a bit more road noise into the cabin.