you lost power on the 87 eco tune from the 91 performance? I believe you but that makes no sense at all. honestly I have all of his tunes but I am only gonna use his 91 performance. if I tow on a trip over 5 hours I will swap to the tow tune but I already towed on the performance tune I cant tell anything lol.
No, I lost MPG from the 91 Performance tune to the 87 performance tune . Im a vendor for 5 star and I try everything we sell . The truck runs a lot better and more efficient on the 91 tune . Hence why even in the manual it states, "87 -401 hp , 91-411 HP . Its a heavy truck and when running a higher octane and more tuning benefits from the added performance with the weight and etc .