I have seen a couple of fuel mileage posts but I figured Id start my own because this is F@#$[/EMAIL">F@#$"]F@#$ (<A href="mailto:F@#$)@# WACKED...or I am.

My truck has a volant cold air intake kit, 4 inch exhaust from the turbo back, 6 inch lift, and 35's on her. When I don't have the edge controller plugged I am lucky to get 13mpg...it normaly will be 11.9-12.5mph. This I mind you is unloaded just everyday driving to and from work (29 miles 1 way). When I plug in the controller the truck shoots up to anywhere from 16-18 in the same driving day to day. I run the edge at Level 3, Defuel on 4-5 gears, and #4 for Low Boost. Can someone explain such a large spread? I am at a complete loss....Logically speaking you add a performance chip it should if anything burn maybe a bit more or it is possible I guess to get a bit better mileage but in the toon of 4-5mpg difference on the low end? These numbers btw are coming right from the DIC. The truck has 39K on it....Without the edge I get about 350-400miles per tank of gas (tank is 35 gal dry), with the edge I am in the high 400 low to mid 500's. Either my guages are a tweaked out or the stock program on this truck is HORRIBLE. What gives?

Pit

13 mpg? Owch.

You are an oil companies dream come true.

Don't trust the DIC!

On my '04, my DIC was reading about 1mpg low stock. When I run the EDGE, the DIC shows about 1mpg high on level 2, and on higher levels it should be even higher. I belive that with a programmer, you can pick up milage some, if you can keep you foot out of it.

Make acouple of hand calc milages runs, and let us know.

P.S. Has your speed-o been adjusted for the tall tires?

I will have to do that next round to get the real readings. As for my speedo yep it's off and GM claims they can only calibrate to 33" inch tires. I don't want to spend the 200 or more smackers just to calibrate the speedo...Other alternatives?

I am in the same boat too, and mine just has 285's. My Edge did help about 1 mpg, hand calculated. Dealer never could find any problems, I just figured I'd take it in the a$$ and deal with it. But it does suck.