Any lift will change fuel mileage. You are taller and more air can get under the vehicle to slow you down, so it will affect fuel mileage.To answer your question, a lift will have no effect at all. Its when you change your tire size and dont regear that it goes to shit.
Yeah, in all honesty I think each truck is differant. My buddy has a stock 07 Cummins an averages around 20mpg, but when mine was stock I was only hitting maybe 16mpg on my harder driving and babying it and staying around the speed limit and not going over 2k rpm on takeoffs I was around 17-18. Its pretty much a hit or miss on diesels. I think theres guys that are getting very high numbers on stock powerstrokes and duramaxs and then theres some that cant get anywhere close to that.nice sounds good southern2500 not a big difference there at all ;-) what i like to hear.
Damn! Something must have been wrong. I lost 2mpg when i lifted 10" & went up to 38.5 Boggers ON 3.73s!yeah i was just wondering with diesels torgue and hp if it made as much of an impact as it would with say a 1500 gasser. I lost about 10mpg when i lifted mine and regeared for an example.