Economy vs. speed

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Only up to the point where the engine stops knocking. Once that happens, extra octane doesn't do anything other than drain your wallet.
If an engine is built for 91, you could put 110 octane avgas in there and not see a difference over 91.
Tom.
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Miller wrote:

...up to the octane rating the engine is optimized for. You won't gain anything with 104 Unleaded racing fuel, unless you are chipped and/or supercharged.
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Horsepower, yes, economy...nope.

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