The 2016 GMC Acadia is available as a 4-door, 7-seat sport utility. Starting at $30,975, the 2016 GMC Acadia SL FWD is powered by a 3.6L , 6 -cylinder engine that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway. The top of the line 2016GMCAcadiaDenali AWD , priced at $ 49,890 , is powered by a 3.6L , 6 - cylinder engine that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway.