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Information on Octane rating...
Posted by Theo (more from Theo) on Tue, 9 Jul 2002 18:13:11
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Just thought I'd drop this information in as I have wondered about the differences between the US and Canada. Still doesn't clarify it totally because I'm not sure if RON is used at all in the States. I know for a fact that in Canada it is Road Octane Rating. See below for details:
Regards,
Theo
1997 900SET Coupe
Technically there are three different "octane numbers" associated with every gasoline. The Research Octane Number, or RON, is measured under fairly easy test conditions. The Motor Octane Number, or MON, is a tougher test measured at higher engine speed and temperature.
The value that relates most closely to actual driving conditions is the average of these two values: Road Octane Number = (RON + MON)/2.
Occasionally, less scrupulous gasoline outlets will use the confusion of these different octane measurements to exaggerate their octane rating claims, by advertising their fuel's Research Octane Number - which will be higher than the Road Octane Number. Motorists should always be sure that the octane number a vendor advertises is its Road Octane value, not its RON.
posted by 24.156.76...
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