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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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Yeah, you're preaching to the choir....pretty much everyone in this forum understands that.. which is why I mentioned being able to run more compression and more camshaft when running higher octane fuel...