The 2019 GMC Terrain is available as a 4-door, 5-seat sport utility. Starting at $25,000, the 2019 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 2019GMCTerrainDenali AWD , priced at $ 39,500 , 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.