ways i can get better fuel economy?? - Ford Powerstroke Diesel Forum
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Old 05-21-2011, 12:22 PM
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ways i can get better fuel economy??

I need some tips on ways to get better fuel economy! i just bought a 99 f250 7.3 powerstroke, its on 6inchs with 35x12.5x18 toyos on 10 wide xd diesels, it had the ts 6 pos chip in it but i took that out and put in a superchips flashpaq for economy tune, it has an after market intake and 4in stright piped exhaust. it seems to only be getting 13 or 14mpg.
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Old 05-21-2011, 12:49 PM
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Loose the big tires and lift would help. Check for codes
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Old 05-21-2011, 12:49 PM
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Did you calculate the difference in tire sizes or adjust your speedometer?

If not, then your mileage is better than you are reading.
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Old 05-21-2011, 12:53 PM
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Tire Size Calculator - tire & wheel plus sizing

Try this.... Going from 265's to 35" is a 9% difference.... so when you do the math, you go from 14mpg to 15.25 mpg.
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Old 05-21-2011, 03:51 PM
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No amount of money you can spend will have as big an effect as the way you drive will....

Keep it under 2000rpm and Never apply any more than 1/3 throttle

Remember, you're haluin' around 3 tons of, un-aerodynamic, truck with a Big Block diesel engine.
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Old 05-21-2011, 10:36 PM
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Quote:
Originally Posted by NoRalPh View Post
No amount of money you can spend will have as big an effect as the way you drive will....

Keep it under 2000rpm and Never apply any more than 1/3 throttle

Remember, you're haluin' around 3 tons of, un-aerodynamic, truck with a Big Block diesel engine.
but even then driving it right you get very impressive mpg for the weight.. i mean look at any 250-550 with a v10 they're lucky to get 10mpg..
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Old 05-23-2011, 06:16 AM
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Dubinsly, thats what I get most of the time in the city.......

I was hoping to get some advice from this thread also.

I just returned from my first highway trip with the truck. TS- 6 pos on 75hp tune, going 70mph I only got 15.5 this was with cruse on, no AC, windows up. Boost around 4-6 most of the time.

On the way home I clicked it to 50hp tune and got 17.2, but that was with a very strong tail wind, no AC, windows up. Boost ready between 3-5 most of the time

I want to know what some of you are doing that claim 18-20 mpg on the highway.

I have stock tires and only a leveling kit. What gives.....
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Old 05-23-2011, 09:02 AM
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TS with custom tunes ..IMO TW, exhaust and Tymar..then if you want better get stage 1's..splits are not the best for MPG's..
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Old 05-23-2011, 10:26 AM
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Well myself personally I have intake/filter, and straight pipe. So thats covered.... Unless you think full 4" would help that much with economy.....

Do you really think TW custom tunes are that much better than the canned TS performance tunes. I guess I am a little skeptical of spending an extra 150 on it just going by peoples words. Any dyno proof? Actual documented fuel mileage gain proof.

Since this is a fuel milage thread......Do you think a my slight o-ring oil leak(about 1qt every 3000 miles) would hurt fuel econ?

Do you think I could potentially have leaky intercooler boots? I see some oil down there but I still build 25psi of boost in 140 setting? Could this hurt fuel eco...?
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Old 05-23-2011, 10:33 AM
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No any additional exhaust mods won't make a difference.

Proof..check the thousands of posts..here and the other forums.

You sure its O rings..how many miles..more info sure makes it easyer...
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