I bought a new f150 in 2011. I got the eco 3.5, but it had the high number rear end. After 6 years, I am trading mostly because it got only 13.2 over the life of truck, 34k. So now I will try a f150, 5.0, with the 3.31 rear. I expect at least 20mpg. My son has one and gets 22mpg on high way. So I am hoping. We like the 6.5 ft beds.