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Higher octane does not mean it burns "slower". It simply means it is initially harder to ignite. Think of it as the 'stability factor'. If your owner's manual says "91 octane recommended" you can get away with a lower octane rating unless you're really flogging it. If it says "91 octane only" then you're going to suffer from pre-ignition by putting anything less in it.
I've used regular (87) fuel in my motorcycle when the only station in miles was out of anything remotely resembling high-octane. I kept the revs down, and limped it to a station that sold 91 without any ill effects.
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