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Message: <blockquote data-quote="YellowFlash" data-source="post: 1064719934" data-attributes="member: 81387">The Mark X engine has a high compression of 12:1. Typically for higher compression engines, it is recommended to run higher octane fuel to prevent engine knocking. However most family sedan (typically non-sport models) are able to accept Ron 95 as the ecu will retard the ignition timing when lower octane fuel is detected. Mark X's higher compression engine should be able to utilize and extract more power from the higher Ron 97 hence it should make a difference in terms of power but then it depends on how fast the ecu learn and adjust to make use of the better fuel. For my car, i can't use lower octane fuel as my engine will be knocking if lower grade fuel is used. Even Ron 97 is a little bit risky once my turbo is boosting (compression goes up substantially during boost), i'd rather pay for the fuel more than getting my engine fail prematurely. you can read up more on engine knocking here -> https://repairpal.com/engine-knockingMore on octane rating -> https://www.carthrottle.com/post/engineering-explained-high-vs-low-octane-petrol/</blockquote>

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