its quiet the opposite, high octane fuel ignites from higher temperatures (such as spark plugs etc ) and results in a normal combustion wheras low octane fuel might pre-ignite by low temperates in cylynder hot spots etc and will turn an engine to scrap. you will not get a lower engine temperature if u use RON and u will not get more kms off ur tank. infact i usually get about 90kms more evrytime i fill up with regular unleaded, i've done this a number of times and results are similar with my car everytime.Originally Posted by mugeneration
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