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Message: <blockquote data-quote="mnas" data-source="post: 323338" data-attributes="member: 4042">yup, i can't agree any further that the base petrol is similar for all the designated RON. it's the amount of oxygenate/additives that makes up the RON...e.g. MTBE / TAME / ETBE  or even ethanol.i remember that even when producing MTBE, we nvr produced less than 99.0% purity (rest being benzene and others). there is no advantage for manufacturer to produce 99.9% purity as it increases processing cost...bare minimum is the way..unless consumer is willing to pay. there used to be RON 100 (Techron 100 by Caltex) in S'pore some years back, but it was discontinued quite shortly after that.</blockquote>