Efficiency
Everything about the Duramax® turbo-diesel engine has been engineered to optimize fuel economy. The engine is rated at 23 mpg in the city and 30 mpg on the highway, with a combined rating of 26 mpg.* When equipped with four-wheel drive, this rating drops slightly, produces even better traction and control. Its lightweight aluminum alloy construction and Active Thermal Management contribute to its efficiency, too.