The 2020 GMC Terrain is available as a 4-door, 5-seat sport utility. Starting at $25,000, the 2020 GMC Terrain SL FWD is powered by a 1.5L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 26-mpg in the city and 30-mpg on the highway. The top of the line 2020 GMC Terrain Denali AWD, priced at $39,900, is powered by a 2.0L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 26-mpg on the highway.