These guys have given you a pretty good idea of the mileage. If I'm real careful on the highway I can get 14, around town it's 8. Never had any real trouble with the truck it does what I ask, maybe a little slower than a 6.0. You just can't bring up mileage and a 5.4 Super Duty in the same sentence. It's a working truck nothing like a half ton or make believe 3/4 ton Chebbie.
i can get 15mpg with my '99 f250 reg cab long box. its a 5pd manual with 4.10 non ls. i can cruise through town at 30mph in 5th gear lol kind sad.
too bad the guy who bought the truck right away didnt order 3.73s...
i have an 03 f250 super duty ext cab auto with 5.4L 4x4 3.73 rear end and installed a k&n fipk and borla cat back exhaust. i use royal purple oil and just changed front and rear axle, trans axle and trans fluids to amsoil. i have michelin 275/75/16 tires getting 18 mpg on highway and around 12 in town.
I had a regular cab '01 with the 5.4 and a 5 speed, 2.5" lift and 315 x 75's that I got 19 with when running the passes from Durango Co to Grand Jct. It got 14 on a regular basis other than that one exception.
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