Gmc Terrain 2024 Mpg. 2024 gmc terrain mpg ratings the at4 and denali earn a 23 city mpg and 28 highway mpg, while the slt and sle trims earn 24 city mpg and 29 highway mpg. Fuel economy of the 2024 gmc terrain fwd.
Detailed specs and features for the 2024 gmc terrain including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more. 1984 to present buyer’s guide to fuel efficient cars and trucks.