The EPA has certified the diesel-powered versions of the Chevrolet Colorado and GMC Canyon at 31 mpg highway -- the highest rating of any truck, big or small, gasoline or diesel -- sold in the U.S.
2021 GMC Sierra 1500 Diesel Engine. On the other side, the engine lineup will remain untouched. This means that the 2021 GMC Sierra 1500 Diesel will continue with a familiar 3.0-liter six-cylinder turbodiesel, which is good for pretty impressive 277 horsepower and 460 pound-feet of torque. The engine comes in pair with a 10-speed automatic ...