I'm not sure about doing it without using premium fuel, because IMO, it isn't cost effective to get a chip that will JUST improve your shifts. If you were to increase performance and use a mid-grade fuel, then it would probably be worth it, but at $200+ for a decent chip, it's probably pointless.
BTW, I see that you just joined us...welcome!
JR
BTW, I see that you just joined us...welcome!
JR