that box you ordered from ebay has a money back guarantee. I would get my money back lol

if you have different size tires the readout wont be accurate and its barely accurate as is

 

thanks guys, i think i will get the superchip, and return what i got in ebay...i looked up on the internet what MPG these trucks came out with and saw it was 14 city 19 Highway...and at them moment im at 12.9 city...havnt tried highway yet, so i guess ill get the superchip for the performance

 

only losing 1.1mpg for that much lift isnt bad...or is that after taking the lift off

 

My Original set up was 6 inch fabtech lift (which is for sale) and a 3 in body lift, i know i have after marker gears but im not sure which ones, i THINK there 4:55's. and i was running 37x1250R17 cooper stt. I was getting 10.2mpg...i removed the lift and now running LT295/70R17 8ply and now im showing 12.8 mpg. Im going by what the display says.

 

Yes, I have been using a Superchips 3815 with my 2007 4.7L for about 18 months. In fact, it seems the only choice for my model year. The 3865 is the newer version, which will allow you to buy the tranny tuning if you so desire. 3815s do not support that, but they do have some tranny adjustments that are part of the canned tunes.

I hope to try some basic back to back testing with and without the 87 tune. If I get it done, I'll post my results. I suspect we'll see 0.5 to 1 mpg, but I am not sure yet... The 87 tune does increase seat of the pants feel while driving.

Going back to stock ride height will help your MPG. Not sure how much...