Your not going to get good mileage with 6" of lift and 37" tires.

So 12.7 will be the best you think dieseldawg? I primarily want to ditch the canned tunes for transmission longevity and if possible better all around performance.

Will you notice a huge difference, probably not...

And yes, driving an 8k pound vehicle lifted with 37" diameter tires, 12.7 is probably right around what you'll get...

And you want to buy one...LOL

I get between 10-14 with mine...

I would only part with my truck for one truck... And when the doucher owner realizes he needs to sell it and get himself a 6.4, I will be first in line... :w2:

Find me a 6.4 with blue interior... and I will sell mine real cheap to someone... LOL

I've got a 2000 crew cab long box 4x4 with a ts 6 position chip 33s n I get 15-19 15 mainly since they've switched to winter blend fuel n I've got a bit of a lead foot

im getting around 15.5 mostly highway with my ppe chip and 36x15.50, thats a crew cab long bed with ranchhand bumpers....

How do u like ur ppe chip I'm not to fond of this ts chip n kinda looking for something else I don't like the way it makes my tranny shift at 40 I shift to overdrive no matter how hard I'm on it then I try to pick up speed and I watch my egt go up 200*+ just to pick up 10 mph

i like it a lot so far but it kissed my tranny goodbye and i wanted to build my tranny so ive been saving almost two months and the truck is getting it put back in on thursday and 2800$ later i feel better about romping on it, check out my other thread on overboost code tho i would like to get to the bottom of that