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Message: <blockquote data-quote="ALBundy" data-source="post: 492252" data-attributes="member: 15">This test doesnt mean anything.  All brands of fuel whether it's Petronas, Shell, BHP, Caltex, Esso and Mobil, and irregardless of whether its RON 95 or 97 have the same calorific value. Meaning to say in lay man's term the amount of chemical energy is the same.  It is the design of the combustion engine, ie; compression ratio, ignition timing and etc, that determines how much of this chemical energy is converted into kinetic energy (which is what everyone is interested) and the rest into heat.  To check which fuel has the highest RON, one needs to get the proper measuring equipment. The machine/engine would be running with the ignition timing kept advancing till a knocking sound is pick up. Only petrol companies can afford these machines.</blockquote>