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Message: <blockquote data-quote="ssmann" data-source="post: 440706" data-attributes="member: 18956">Bros - let me tell you a secret.....this is direct from the Chief of Petroleum for a large oil company, and the best version I have seen is on Paultan.comRON = Reseacrh Octane NumberRON stands for Research Octane Number, a rating used to measure a fuels knocking resistance in spark-ignition internal combustion engines. Knocking is what happens when parts or all of the air-fuel mixture prematurely ignites before the flame from the spark plug can reach it. This can be caused by ignition timing that is too early or engine overheating, where the heat from the cylinder itself causes the mixture to combust before the spark plug can burn the mixture. This causes a decrease in performance and might also harm the engine. It is a misunderstanding to think that RON97 fuels produce more power than RON92 fuels, even more so with the fact that in reality a higher RON number means the fuel burns less easily! RON refers to the ability of the fuel to resist knocking and nothing else. By pumping the RON97 into a car which engine only requires the RON92, all you’re going to get is an emptier wallet – that hardly counts for performance gains via weight reduction!  In summary, most Japanese (I don't have enough insight into RX8 or rotaries, but suspect it is because it is designed for high knocking, thus need a 97 to run. In Japan got RON100 also) and European made models up to year 2006/7 would state that a min RON90 is required to run the engine. But pls ensure it is unleaded :wink:I promise you, that higher RON does nothing for your engine, mileage or performance, but lower than recommended RON, does.Hope this helps to clear the myth, from a purely technical petroleum chemistry standpoint :wink:</blockquote>

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