Hey, just a little revisit to this. I am getting a lot better fuel milage now. I'm getting 13+ when driving it hard and around 16-17 driving it right. But when you can turn over 35" tall, 13" wide tires with a stock truck....kinda hard to drive it right!!! Also, I'm going to switch to 4.56 gears.... I think, or maybe something between 4.10 to 4.56

 

That didn't last (16-17 mpg). There was something wrong with the turbo and the good fuel milage would come and go. When it went, it was real bad. I have had the turbo replaced and that didn't help much. I've also had the computer reprogrammed several times along with the correct tire size programmed in. Plus the shop has done a few other small things to it and so far nothing works.