Did our first decent trip in my truck from lubbock to Ennis over the weekend 1100 miles round trip ( approx) . I'm proud of the ol girl she did great netting 16.4 mpg on the way down and 17.1 on the way back. I had my foot in it a little more on the way to the race track ( we were excited to get there ) slowed down a bit on the way back driving tired and in the dark. Going from my old 460 cclb to the 7.3 ccsb is night and day mileage wise. I do wonder how much I'll lose when I put the lift and tires on it though. Overall couldn't be happier .