Horrible mileage on 2002 7.3

[wanta7.3]

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

[BigKid]

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?

[atvrider93]

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

[ridiculously_necessary]

yeah the tires and gearing is killing it. also agree on the hand calculate.

[mas360]

If mileage is that bad, first thing I would check is the brakes. Make sure they are not locked.

[atvrider93]

might as well check the front wheel bearings too

[APEowner]

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.

[wanta7.3]

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.

[NoRalPh]

Any neighbors also have a diesel?

No drips on the driveway by the fill cap? Hose marks?

[wanta7.3]

Originally Posted by NoRalPh

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.