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As octane is added it reduces the fuels volatility..making it less reactive thus less suceptible to pre-ignition. By doing so it also reduces the fuels power producing ability...the reason higher octane fuels 'make' more power is because the engines that they do so in were out of 'spec' for the lower octane fuel...ie...poor tune, too much realized compression, too small cam etc....and required the higher octane to produce proper combustion. The most power is made when using the LOWEST octane fuel you can use WITHOUT encountering pre-ignition.

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I love it when guys go to the track the one time only for the year and the first thing they do is go buy 110 race fuel for their 9.5 compression motor.

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OK I'll rephrase my previous post.

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I would build my motor to run race gas all day if it was as cheap as pump gas. C12 is around $30.00 a gallon and C16 around $38.00 a gallon over here.
For comparison pump gas is around $8.00 a gallon. Just my
Cheers, Tig

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