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For people who don't think lower octane isn't more prone to knocking or pre detonation you should probably read into what the octane rating mean "Octane ratings are ratings used to represent the anti-knock performance of petroleum-based fuels (octane is less likely to prematurely combust under pressure than heptane), given as the percentage of 2,2,4-trimethylpentane in an 2,2,4-trimethylpentane / n-heptane mixture that would have the same performance. It is an important constituent of gasoline." -wikipedia is your friend.
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