I get 16-mpg in my One Ton. In town, around town, and loaded or empty. I'm in fourth my 20 mph, 15 mph unloaded, as my truck has the 5.14. I would imagine that on the highway going a steady 45-mph, I would do better. But, that never happens, and I accelerate slowly, though all 4, every time. The truck runs 35 miles a day, so it gets to warm right up. Its as good as any real truck I've ever driven in town.