A 35 is a heavier tire and larger rotating mass, which will take more fuel to move them. And the 5.4 does have plenty of power for a 35 but is always recommended to re gear to keep the power where its needed. You will notice, as anyone... with a 35 vs your stock tires a decrease in power or a bit more sluggish off the line. You can just feel it. You can go to a lift and 35's and re gear.. you could see the same mileage as you had before but I don't see where just "lifting it and putting 35's" will yield better mileage. Again, with the right mods, you can be lifted on 35's and get better mileage than some, if you have the gears and supporting mods to do it. Also depends on whether you are 2wd or 4wd
Last edited by Toyz; 01-26-2011 at 12:12 AM.