Thread: Octane??
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Old 03-28-2013, 09:52 PM   #8
Jaak
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Join Date: Oct 2009
Location: Toronto, Canada
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From the Canada Forum on Rennlist that I had posted:


Did the search:

To clear up a bit of confusion in North America we use a CLC measurement. CLC is 4 points LESS than RON which is used in the rest of the world so 95 RON is equal to 91 CLC. If your car needs 93 RON ... it will be more than covered with Shell 91. See this link Octane Ratings

Here's another link: Octane rating - Wikipedia, the free encyclopedia

In most countries (including all of Europe and Australia) the "headline" octane rating, shown on the pump, is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, is 9192 in Europe. However most European pumps deliver 95 (RON) as "unleaded", equivalent to 9091 US (R+M)/2, and some even deliver 98 (RON), 100 (RON), or 102 (RON).[2]



Sunoco 94 has close to 10% Ethanol. Look at the sticker on the pump.
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