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Message: <blockquote data-quote="aspec_fc" data-source="post: 1226843" data-attributes="member: 7188">what i know for sure is that octane rating is more like anti-knock rating. knocking is a problem face by many turbo cars and the higher the octane is; the more resistance it has for knocking. NA has no problem with this at all. therefore, whatever the owner's manual states, that's the octane i'm going with which is 87. but i get 92 in malaysia. you will use higher octane gas when u find the engine having knock. else there shouldn't be any difference between lower and higher octane. race fuel have different compound of course in higher octane. the last time i read about this, if u use a higher octane fuel, u need to advance your timing to get the power out of it. else, it doesn't help at all.edit: WARNING: mess with your timing at your own risk.</blockquote>

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