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i've heard that octane only affects engine knock. thus, you should use the lowest possible octane that doesn't cause the engine to knock. however, i've also heard that the octane can affect the performance of the engine. what is correct?
say i use 87 on my striple and there's no engine knock and everything is operating as it should. would i get a boost in performance if i put in, say, 91 octane fuel? would the life of the engine be extended by using a higher octane fuel?
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