Quote:
Originally Posted by pmeloche
Yet another forum member who does not know the difference between octane rating in North America and most of the rest of the world. In South Africa and most of Europe they use the RON number for their octane rating while in North America we use the average of the RON and MON numbers. So a RON of 95 translates to an octane rating of 91 in North America.
The MON number is usually about 8 lower than the RON number so the average of both numbers roughly comes up as to about 4 less than the RON number used in Europe and South Africa and Australia.
That is why on our pumps in North America we always see the octane rating being (r+m)/2.
Cheers.
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most important post in the thread our 91 is roughly europe 95, and at higher alt you need less octane