my mpg is awefull 2008 auto stock everything with 2500 miles today the damn mpg display is showing 12.9 LoL! I sure as hell hope this improves

 

That doesn't sound right, I am getting 15.6 with a kilby skid plate, shrockworks front bumper and aftermarket wheels and tires. Is yours an unlimited? hard or soft top?

 

Wow...That sucks!! I was getting about 16/17 out of mine...Stock X with 3.73 w/ auto. Now with lift and 33's I can get about 11mpg!!

 

unlimited X Hardtop... It has been about 14.6 but all of the sudden it has dropped??

 

Been getting ~16.1 Mpg with some mods & running 33s on the Jeep...

 

Im around 15mpg with just the lift and no 35's yet.

 

I have a little over 400 miles on my stock 09 Rubi with the autogearchooser. Filed up, reset the mpg gizmo. Drove about 100 miles today and it says 20.4 mpg.
I'll take that.

 

Push and hold the button, it will reset to 0. then set what you are getting. Also make sure you are on MPG not KPG
I get 17-18 with RRC bumpers and a winch. I have an auto and 4.10s..and that is city driving

 

Don't trust the computer unless you have verified it is accurate. Mines seems nuts-on, but there are a lot of posts where people complain it is off. What I do:

1. Reset the MPG only when I fill up
2. Keep track of the miles I go and gallons filled at each fill-up
3. Compare the miles run vs gallons used to the trip computer

If they compare, great. If not, keep note of it. I log every single drop of gas and plot against every single mile run. OK. I'm a nerd. But I can vouch for my MPG computer on the JK - well within .5 MPG.

 

I have a stock hard-top X unlimited, 255/75R17s, 3.73, nearing 6K miles and am getting around 17.5 mpg.