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Message: <blockquote data-quote="saru-kun" data-source="post: 1926288" data-attributes="member: 1524">Not necessarily difficult to understand really.When we talk about octane rating of fuels, bear in mind that there are three standards that we can compare to:Research Octane Number (RON)Motor Octane Number (MON)Anti-knock index (AKI, which is essentially the average of both MON and RON values)As you may have noticed, Malaysia utilises the RON rating and while I know nothing at all about the law requiring us to be limited to RON97 (phat7, an article or something for me to sniff somewhere? =P) we are still quite lucky to be getting above average RON fuels. In UK its about 90p for RON95 gas, so... :mouth_closed:As has been mentioned by v0ices, the higher the octane rating, the better its resistance to knock. This allows it to run at higher compression where the thermodynamic efficiency is higher, hence more power. The highest octane rating petrol can go up to would be around 110-115 octane. Anything higher it would have to be a bio-ethanol blend or straight alcohol...with ballpark figures approaching 130 or so.Cheers</blockquote>

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