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Simple,

If you engine requires 91 octane, and you put 87 in it, you will experience a degradation of engine performance, due to the lower octane having faster burn properties.

If your engine requires 87 octane and you put high octane (90-91 octane) fuel into it, you will NOT see a performance boost, and may even see a slight decline in performance.

What 99% of all people don't know is that High Octane fuel actually burns more slowly, than lower octane fuel. This property, allows higher compression prior to detonation, hence more performance at combustion.

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15y ago

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