On my 2007 auto it improved the throttle response and that is about all. May have been minor performance improvement but nothing on the MPG.
I always reset to stock if I'm taking it to the dealer since the dealer may update the electronics with the latest patches and this could lock the tuner. I think SuperChips charge $100 to reset it. Better safe than sorry.
Superchips website says 21HP gain if you go to the performance tune. means switching to 91 octane fuel. Am going to try it when I fill up next week. Will let you know if it makes any difference.
2007 Sahara Unlimited
4x4, Auto, Jeep Green, Tow Package, Soft top, 3 inch spring lift, MBRP Catback