i get 24 mpg on average with 245/75R16 tires on 3.45 gears
i used to get 26-28 on average before i got the bigger tires
and i don't drive like an old man either.......
1996 XLT 2.3T "White Lightning" 5/7 dropped, Turbo street toy
2006 FX4 Off Road, DD, work in progress
1985 XLT 2.8L 4x4 "The Black Pearl" (retired but still around)
1987 XL 2.3L 2wd R.I.P.
your mileages seem really low. i've put 2k miles on my truck in the past month and never got below 22mpg. the best i've seen out of a full tank was like 25 mpg that was from a tank that got over 400 miles..