The 2016 GMC Terrain is available as a 4-door, 5-seat sport utility. Starting at $23,975, the 2016 GMC Terrain SL FWD is powered by a 2.4L, 4-cylinder engine that returns an EPA estimated 22-mpg in the city and 32-mpg on the highway. The top of the line 2016 GMC Terrain Denali AWD, priced at $35,925, is powered by a 2.4L, 4-cylinder engine that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway.