My little 360 runs on 91 octane in a 4200# truck and still manages 10.90s on it at the track on the 91 octane. It drives thousands of miles in that configuration.

I DO however add race gas for insurance when I turn it up enough to make it go 10.60s. I MIGHT be able to do it without the race gas - but race gas is WAAYYYY cheaper than new parts. I'm not quite sure why anybody would have a problem with the fuel I use. I don't hear anybody bagging on people for running slicks at the track. What's the difference?