Horrible mileage on 2002 7.3 - Ford Powerstroke Diesel Forum
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Old 10-07-2010, 06:20 AM
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Horrible mileage on 2002 7.3

Well I finally got a truck and am loving it so far, but I am looking for some help on the trucks mileage, the overhead gauge in the truck shows its getting 7.7 miles to the gallon and I know itt cant be getting much better than that.

The truck is a 2002 F250 FX4 with 163,XXX miles on it, it has an 8" lift, 20" wheels and 40" tires, the truck has 4.56 gears and a Cold air intake and an Edge programmer. Now I know the lift and big rims and tires aren't helping me but I thought with the 4.56 gears and the CAI and the programmer that I would still get decent mileage. I would be happy with around 12mpg but I dont think its getting anywhere close to that.

Any input would be appreciated.

I do love this truck though.

Here are some pics











Last edited by wanta7.3; 10-13-2010 at 05:20 PM. Reason: Added pictures
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Old 10-07-2010, 06:36 AM
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Man that does seem pretty low. Have you had a chance to hand calculate it to know for sure what it is doing?

Excessive idling or doggin it hard?
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Old 10-07-2010, 06:42 AM
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you might want to think about a different programmer. Those tires are killing your mileage and thats pretty low gearing espesially if you drive a lot of highway
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Old 10-07-2010, 06:57 AM
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yeah the tires and gearing is killing it. also agree on the hand calculate.
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Old 10-07-2010, 08:12 AM
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If mileage is that bad, first thing I would check is the brakes. Make sure they are not locked.
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Old 10-07-2010, 08:31 AM
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might as well check the front wheel bearings too
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Old 10-07-2010, 08:34 AM
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The first thing I would check is the odometer calibration. The gears and tires could throw that off quite a bit and both the computer and hand calculating are dependent on that being correct.
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Old 10-07-2010, 10:26 AM
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I havent done it yet, but I will hand calculate the mileage the next time I fill up. This is my first diesel and my first big lifted truck so I didnt know what to expect.

I don't think the brakesare locked up, isn't that smetiong that would be very noticeable.

As far as the gears go, most of my driving is in town.
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Old 10-07-2010, 10:34 AM
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Any neighbors also have a diesel?

No drips on the driveway by the fill cap? Hose marks?
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Old 10-07-2010, 02:09 PM
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Quote:
Originally Posted by NoRalPh View Post
Any neighbors also have a diesel?

No drips on the driveway by the fill cap? Hose marks?
No I noticed how bad the mileage was I drove it home from the dealership, which was about a 120 mile ride. I filled it up right before I got on the interstate and 120 miles later, I only had 1/2 tank left.

What size fuel tank is on my truck, Im thinking it is a 26 or 29 gallon.

Also if anybody else is using the Edge programmer what settings are you using, I set mine on the lowest setting and havent noticed any diff. in the mileage, when I got the truck the max EGT was set at 1350, is this right or do I need to lower it.

I dont know if it matters but the injector o rings were just replaced and I am getting some white smoke when I really gwet in the pedal, its not a bunch of smoke but moderate.

Thanks for any help.
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