The GMC Terrain shares much in common with the Chevrolet Equinox, its corporate cousin. The CUV comes standard with the same 182-horsepower 2.4-liter engine that powers the Equinox, and achieves 32 miles per gallon on the highway in front-wheel drive models; a 301-horsepower V6 is optional for most Terrains, as is all-wheel drive.