Quote:
Originally Posted by maytag
Not sure where you're at, but you're probably looking at RON numbers. Not the same rating scale. (Unless you're regularly buying fuel at the racetrack).
From wikismedia:
"Another type of octane rating, called****Motor Octane Number****(MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON.****MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable****ignition timing****to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern pump gasoline will be about 8 to 12 octane lower than the RON"
RON is more common worldwide, but RON has been the US standard for a long time. (Though we're beginning to see RON listed at many US pumps)
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I live in Spain by gas on US installation pump states 95 Octane in town pump tates 98 Octane, but on the base they are required post us rating. Will look to see if it say RON though.