16 MPG combined isn’t just a number for the 2025 GMC Sierra equipped with mud terrain tires, 4WD, and the 2.7L turbo four-cylinder; it’s a mission statement. This isn’t a vehicle chasing economy records. It’s a truck built for work, for challenging terrain, for those who need a capable machine that can get them and their gear far off the pavement. The fuel economy figure, in this context, needs to be understood as a byproduct of its strong design and off-road capability, not its primary selling point. Buyers of this specific Sierra trim aren’t scanning hypermiling forums; they’re looking at ground clearance, available torque, and the ability to confidently navigate trails or construction sites where lesser vehicles fear to tread. They