OK, I just have to speak up here as this is a pet peave of mine.

Higher octane fuel does not "burn slower". The octane rating is NOT what determines the burn rate. Octane level determines what level of compression the fuel can take and still resist DETONATION.

The fuel composition is what determines the burn rate. They make alot of race fuels specifically designed for different engines. To be an effective race fuel, it needs not only the proper octane level, but the proper burn rate for the application. The burn rate should be different depending on the peak RPM of the race engine (lower peaks require a lower burn rate). This is why Aviation fuel is a poor choice. It may have the proper octane level, but the burn rate is designed for engines that dont turn faster than 4,000 rpm. Most gasoline airplane engines run around 2500.

If you want some seriously good info, look here: http://www.eric-gorr.com/techarticles/Fuel_Basics.htm
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
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