Sorry to revive an old thread, I have and 03 42 RLE TJ SPORT with Dana 60 and dana448.9 with 5.38 gears and i get 10 mpg on highway 9ish in city. I use to get 15 with stock axles 3.73 d35d30. All of this is with 33 inch tires Mickey Thompson, is it possible that upgrading to 35inch tires will improve my mpg? Since I am overgeared? Dumb question, i know. For what its worth I have all new IAC, TPS, and MAPS. Is this mpg loss all the added weight? I also have some parts laying in the jeep now because I am moving