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Old 05-03-2007, 12:49 PM
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MPG issue

I have an 03 7.3 CC 4x4 with 49k on it and my mileage is at 13.3 per overhead display.

The mods on the truck are 35" tires, a DIY Tymar and Muffler delete. I have the EVBP and WG unplugged with stock tuning for now. I am putting guages in this weekend.

Next week is the DP F-5 and a BTS valve body.

Any thoughts why my mileage is so low? I drive conservately non HWY rds mostly to work at 45mph or so.
I know my display is off a little due to tires .9 on odo equals a mile as close to I can figure.
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Old 05-03-2007, 01:00 PM
Almostdunfukinwidit


 

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When they do your chip make sure they know you have 35 inch tires they may be able to adjust for it and then calculate your mileage The lie o meter isnt right even with stock tires
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Old 05-03-2007, 01:09 PM
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Mileage correction is in ABS module according to Jodi, I need a Superlift box or something.
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Old 05-03-2007, 01:48 PM
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well if your running the new fuel thats all you can expect to get. ive got a 02 c/c 350 with muffler delete. bully dog programmer set on 75 horse with all amsoil and before the new fuel i was getting 21 on the highway and 17 in town. now i get 12 in town and 15 if im very easy on it on the highway. you can thank the federal gov. for the mess we are all in.
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Old 05-03-2007, 01:58 PM
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oh and by the way if anybody can figure out how to fix this new fuel problem ill take any suggestions.
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Old 05-03-2007, 02:00 PM
Almostdunfukinwidit


 

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Are you running a fuel additive I run stanadyne and got most of my mpg back with this new fuel
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Old 05-03-2007, 02:18 PM
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I have Stanadyne coming, I just wanted to make sure I didn't screw something up or was missing something. The last diesel I had was an 01 and I could get around 18 to 19 mpg, I just bought this one so the 13.3 was concerning me.
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Old 05-03-2007, 02:21 PM
Almostdunfukinwidit


 

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The new ULSD is annoying alot of people Its gotten a little better here since we are done with the winter blend fuels
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Old 05-04-2007, 05:04 AM
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I have a 99 cc 4x4 that since new never got better then 14. I added a Banks big hoss and got 3 mpg better. No matter how I drive it 16 is it.
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Old 05-04-2007, 05:12 AM
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Xcracer,
you said that was according to the overhead console, right?
What are your calculations? I would figure it out on my own, and not trust that thing.

Mine was telling me between 15.1-15.4, when I was actually getting 17.5!
I've never got more than 570-600 miles in this truck before fueling up, yet when I do fill it up, the computer, in all it's infinite wisdom tells me that I have 780 miles to empty. I WISH!

Mine might be screwed up, and yours might be fine, but it's worth a check.

good luck
chris
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