cant seem to get better than 15mpg? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 4 (permalink) Old 04-30-2009, 04:30 AM Thread Starter
biostroke1
 
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cant seem to get better than 15mpg?

i have a 04 f250 cc 4x4, no lift, 373 gears, auto trans, w/ 165k mi on the 6.0 mods include k&n intake. 5" exhaust w/ 4" downpipe, and a edge juice w/ attitude programer, ive tried a tank on every setting. i drive 60 mi or so round trip to work and back on mostly country roads. not a lot of stop and go. im usually doing about 65mph, and im concervitave on my starts and stops. new fuel filters, fresh oil change. ive had this truck for about 9 months. i had a 01 7.3 the same way that got 18 or better all day. my wifes 6.0 excursion get 16.5 back and forth to target 25 times a week,lol. so wtf is up? ive heard about a ford flash that is bad news for power and mpgs. how do i know if i have it? and or how to get rid of it if i do? does any one have any other suggestions? thanks
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post #2 of 4 (permalink) Old 04-30-2009, 07:40 AM
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Re: cant seem to get better than 15mpg?

Well, 165K? how does the ole' auto shift?
that edge is probably killing you. it enables your truck to use alot more fuel. do you have gauges? that's the easiest way to describe how to accelerate to save fuel.
Also, what is your tire pressure? that's a surprising amount of drag that can be removed easily.
I don't have any idea about a ford "flash" that would be bad for your mileage, but I don't think that would have too much to do with this.
Long bed or short bed?

Dan
96 Powerstroke: 6637, downpipe to dump exhaust, 140v IDM and a shift kit.

84 Honda Sabre V65 1100: pipes, jet kit and new tires. Faster than I think I'll ever need.
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post #3 of 4 (permalink) Old 04-30-2009, 03:17 PM
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Re: cant seem to get better than 15mpg?

How big are your tires? I went from 255/85 x 16 to 285/75 x 16 (virtually same diameter, couple inches wider) on mine and lost 1.4 mpg or so. No lift on mine either. I do have a 95 7.3 but the physics of tire size and tire pressure as mentioned by secondarychaos are the same.

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post #4 of 4 (permalink) Old 05-01-2009, 03:33 AM Thread Starter
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Re: cant seem to get better than 15mpg?

the trucks shifts hard in the am but fine once warmed up.with the edge attitude i can monitor pyro, rpm, boost, and one other but i forget what that is. its a short bed. im running 80 psi in e rated 265/75r 16. the funny thing is that the fuel mileage was this bad even before the programmer. i got rid of my 01 7.3 cause i lifted it 6" right before fuel went to 5$ last year. even w/ the lift i still got about the same mpg that im geeting now. my wife has a sct programmer we run on the highest setting like 150 hp, as long as she drives normal we get like 16 to 18 ronund town and 22 highway.
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