I bought a 1996 F250 4x4 with a 460. I am getting 10mpg with it. Is there anything that I can do to get better mileage? Chip, differential, big tires? What would anyone recommend?

 

You can always go with higher gears, if you're really willing to touch the diff.

Make sure it's timmed just right, electric fan/fuel/water pumps can add up to a little gain, as well as keeping you're foot out of it.

You can always get a gear splitter to turn your 4 speed into a 8 speed..

Edit
Not recomending any one thing. Just tossing out ideas. I never got better than 10 myself, but my engine turned out to be in BAD shape. I just had it rebuilt, and I've put 70 miles on it so far, but haven't measured gas mileage yet..

 

Before shelling out a large sum for the swapping the diff would buying bigger tires 285 and getting a K & N system help?

 

Bigger tires might help it will make your truck higher geared and tach less on the highway. And a k&N is always good

 

Well if you live in a cold area this time of year 10 is the best your goign to get out of it driving like a granny...Thats what i'm getting on 87 and 93 i'm getting 10.7...If you get a chip on these trucks it seems to decrease the mileage not increase it..And if you get tires you need them to be tall and narrow...

 

You could get a vacumn gauge for your truck. The last few weeks I have been driving based on my vacumn reading instead of the tach. Aparrently for my setup, OD wastes more gas at speeds of 60mph or below. I have been using 4th gear everywhere but the freeway and my MPG went from 8 to 10.5.

 

I also installed a vacuum gauge in my truck a month or too ago and found out the same thing...I always thought lower rpm's=better fuel encomy...

 

just wondering but why would vacuum affect mpg's more than than rpm's ?

 

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Vacuum is a good indication of load, and the less load on the motor the better milage it will get. Lightest load will not be obtained at lowest rpm but at the rpm where the vacuum signal is highest for any particular gear. Vehicle weight, gearing and aerodynamics all play a role here, and the minimum load needed to maintain speed in each gear will increase. On level ground you should be able to quickly determine what the optimal speed for milage is, it will be the highest speed the vehicle maintains with the highest vacuum signal(= lightest throttle input).
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1990 F150 4x4 XLT Extended Cab 5.9(351 .030" over), FMS SEFI MAF Kit, Ported E6s, Crane 444232,
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Here the post on the topic...https://www.ford-trucks.com/forums/7...-question.html

 

You want to also keep the vacuum higher than the spec on your power valve. If it drops below, and you are into the main circuit on the carb, the power valve opens, and that is like adding a third main jet to the carb. (read - drinks lotsa fuel).

 

I got efi so i don't think i gotta worry about that...

 

Have a '83 F250 4x4 with 460 bored .030 over with 750 holley headers with 3" exhaust into muffer with 2.5 out with 3.55 rear gear best has been 13 on intersate and 11 to 12 in country city driving

 

yah the other thing to remember here is that the 460 is a work horse. No matter what you do it is 460ci the best millage I have ever heard of was one that our ranch had that got 14 all of the time(stock set up). If you are looking for fuel economy sell your truck and get a car, I realize every little bit helps but its a horse that gets thirsty. With my 460 I dont even try and calculate mpg i calculate % of a tank to an hour. It gets 30mins to a quarter tank if im on the highway, in town, idling, or bumping along in the hills. And thats my rant for the night

 

i got a 79 f150 custom 4x4. its geared to 411, rides on 35's, its got a 460 and c6 swapped in. iam getting 6mpg city and 7mpg highway. my foot is usually into it pretty good...hence the mpg...