I have about 5K miles on the truck now, and the best I have gotten is about 25mpg highway. About 20mpg city is the best, but that is driving very conservatively trying to save gas. I have found that driving freeway, it really depends on the obvious, the terrain, how fast, passing a lot, etc; for me, if I keep it no more than 70mph, and try and keep the rpm's at 2K or less, in eco mode, that seems to be the most efficient. Of course, all that goes out the window, if I am off-road, and I expect that. But I did not buy the truck for strictly off-road use, It is my everyday vehicle, and I love it, by the way!