I get ok mpg's
I have a 2005 Ford F250 Super Cab Longbox with the 5.4 and 3.73 rears. The truck has over 110,000 miles on it and I get around 11.5 driving it to school and back everyday but that is like 40-55 most of the way. I drive backroads that I know like a highway and that helps once I'm in 5th gear. I got 16.5 on the highway one time but I haven't driven much highway since then to check it again.