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Message: [QUOTE="Rich Rohrich, post: 1064235, member: 16241"] Unfortunately gasoline is made up of about 500 different chemical compounds so there is no practical way to calculate octane rating. Even if you knew the correct make up of the fuel, the different components don't always blend in a linear fashion and they can have antagonistic effects on octane when combined. Unless you are sitting in a lab at Exxon it's all just SWAG. ;) It's a suitable fuel for my small block Dodge turning under 6000 rpm, but it's a poor choice for your application. The spike in temps at the end of the curve is too high for your use. That part of the fuel will just end up as carbon in the pipe and spooge, it's unlikely that it will burn in the chamber under normal circumstances. [/QUOTE]