The 2013 GMC Acadia is available as a 4-door, 7-seat sport utility. Starting at $34,050, the 2013 GMC Acadia SLE-1 FWD is powered by a 3.6L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway. The top of the line 2013GMCAcadiaDenali AWD , priced at $ 47,945 , is powered by a 3.6L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway.