88 f250
Posting Guru
Joined: Oct 2011
Posts: 1,179
Likes: 1
From: Pueblo, CO
Remove the air horns from your intake to get better flow. Someone just recently posted a thread with pics on this. Then there is the "six-liter" tune-up. There is also a new thread with a link about this. Finally, go to a reputable muffler shop and get a new exhaust made that flows better.
Biggest thing to improve mileage is to adjust your driving. Wind resistance increases with speed so don't lean on the throttle. Also, what transmission, gear ratio and tire size do you have? A 5 speed will get you the best possible mileage from your truck but if you like autos than the electronic E4od has overdrive. The C6 is bulletproof but no OD so economy suffers.
I have a '90 F250 460/C6/3.55:1ls and if I keep it below 55 I think I'm getting ~12-13. Once I was able to get 15 empty and when I moved I averaged 5mpg over a 1200 mile trip going 60-65 when I could and going over several mountain passes.
Biggest thing to improve mileage is to adjust your driving. Wind resistance increases with speed so don't lean on the throttle. Also, what transmission, gear ratio and tire size do you have? A 5 speed will get you the best possible mileage from your truck but if you like autos than the electronic E4od has overdrive. The C6 is bulletproof but no OD so economy suffers.
I have a '90 F250 460/C6/3.55:1ls and if I keep it below 55 I think I'm getting ~12-13. Once I was able to get 15 empty and when I moved I averaged 5mpg over a 1200 mile trip going 60-65 when I could and going over several mountain passes.
Elder User
Joined: Jul 2012
Posts: 534
Likes: 0
Cut the air horns look a few pages in I just did a write up with pictures on tuesday I believe, bump up your timing, get header back exhaust. Fill out your signature so we know what you have. Like stated above what gears? tranny? tires? all have an affect.
Posting Guru
Joined: Oct 2011
Posts: 1,179
Likes: 1
From: Pueblo, CO
Here ya go.
the tune-up: ignition upgrade and timing bump (no 56K) - FSB Forums
air horn removal: https://www.ford-trucks.com/forums/1...air-horns.html
don't bother with an new intake or an expensive exhaust kit, especially a cat-back system. The airhorn mod and a custom exhaust from a good local shop will be as good as any aftermarket bolt-on.
the tune-up: ignition upgrade and timing bump (no 56K) - FSB Forums
air horn removal: https://www.ford-trucks.com/forums/1...air-horns.html
don't bother with an new intake or an expensive exhaust kit, especially a cat-back system. The airhorn mod and a custom exhaust from a good local shop will be as good as any aftermarket bolt-on.
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