The Buick LaCrosse is the largest luxury sedan and the flagship model of the Buick brand. The CXL adds leather-appointed heated seats, dual-zone automatic climate control, fog lamps, outside rearview mirror with LED turn indicators and puddle lamps, and 18-inch wheels.Buick also equipped the latest LaCrosse with Start-Stop engine technology, which seamlessly powers down the engine at idle to conserve fuel, despite current EPA regulations failing to reflect savings in fuel economy ratings.