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Archer1 · 04-29-2008, 03:35 PM

In the May issue of Modified Mustangs Joe Dasilva says he's seen 05's, especially GTs detonate under load on 87 octane. So my next tank will be 91 octane. In the summer my Yamaha R1 will ping even on 91, so I have to be careful not to short shift it. No engine is ever going to be harmed by using too high an octane fuel. But if you don't need it you shouldn't waste the money.

04-29-2008, 03:35 PM	#41 (permalink)
Archer1 Junior Member Join Date: Apr 2008 Location: Northern California Posts: 12	In the May issue of Modified Mustangs Joe Dasilva says he's seen 05's, especially GTs detonate under load on 87 octane. So my next tank will be 91 octane. In the summer my Yamaha R1 will ping even on 91, so I have to be careful not to short shift it. No engine is ever going to be harmed by using too high an octane fuel. But if you don't need it you shouldn't waste the money. __________________ 05 GT Premium, mostly stock for now...