The 2016 Buick LaCrosse is available as a 4-door, 5-seat sedan. Starting at $31,065, the 2016 Buick LaCrosse 1SV FWD is powered by a 3.6L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 28-mpg on the highway. The top of the line 2016BuickLaCrosseSport Touring FWD , priced at $ 34,065 , is powered by a 3.6L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 28-mpg on the highway.