Originally Posted by jlseagull
I'm still waiting to hear if from people who actually use Regular on the X-Fire, or decided to test to see if it works as well....My initial results so far are encouraging (and FYI, I drive the X-fire like it's meant to be driven, and noticed no change in performance) ...in fact, I seem to be getting an extra 4 MPG using regular over premium!! Weird.
Man - my car pings on 91. I cringe at the thought of Regular. The increased mpg isn't unusual - in fact lower octane burns faster and more
efficiently and all things being equal, actually will make more power. BUT the higher octane permits higher compression, boost, timing, etc. all which will make even more power over just the lower octane fuel.
Joe