2024 Gmc Sierra At4x Mpg Review. This impressive machine gives owners the interior. — with a 19 mpg city, 20 mpg highway, and 19 mpg combined epa fuel economy rating, meanwhile, the diesel isn't quite as efficient as it is in other sierra.
Canyon pricing starts at $37,895, stepping up the ladder to. — with a 19 mpg city, 20 mpg highway, and 19 mpg combined epa fuel economy rating, meanwhile, the diesel isn’t quite as efficient as it is in other sierra.