[ipso_facto]

What we have is the 460/7.5L you described .....


Then that mileage is perfectly normal. That's what I am getting. (And seemingly everyone else with 460) I am almost certain you have the 4.10 rear axle. All F250 460s got it unless you special-ordered a 3.55 - and you don't want a 3.55. Do you have the old C-6 tranny (3-speed) or that newer E4OD which is like C6 with overdrive?

To find out what tranny you have, look on the sticker on the side of driver's door. At least that's where mine is. There are all these codes which tell you which tranny, rear axle, etc. Post them and someone will decrypt them for you.

In any case, lots of electrons have been used discussing 460 mileage improvement. Not much optimism there. The key is to keep your RPMs down. Around 2500 if you can. At 65, I am turning 3100 rpms and that reduces my mileage to 10.5. If I reduce the RPMs to 2500, I get 11 and 3/4 and I think I could get 12 if the RPMs were 2200. With overdrive, you should reduce your RPMs.

Towing 6300lbs, at 3000 rpms, I get about 8.5 MPG. Slowing down to 2600 RPMs, I get almost 10. Do you have dual tanks? You pretty much need them to extend your range beyond 170 miles.