Just got a 2013 FX4 w the 5.0. Averaging 13.4 mpg after 2 weeks. I drive around town a lot but am easy on the throttle. And twice a week I make an 80 mile round trip on the hwy, and I keep it around 75. Fresh tires, oil change and has 70k. Tires are grappler g2 305/55/20.

It has the 2” leveling kit from the dealer. Theres a “your speed” sign up the road that seems to read what im going accurately. I cant really use gps in may area because cell service is very spotty. The tires really arent much taller, if any, than a regular ole truck tire. But they are wider for sure, so concerned about the weight.