Quote:
Originally Posted by Madact
...('regular' is 91 octane here).
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There's a good chance that is 91 RON, which is the same scale that most of Europe uses. The US uses an average between RON and MON (called "AKI" or even "R+M/2") which usually comes out 4-5 points lower for the same fuel. So your "regular" at 91 RON is about the same as our "regular" at 87 AKI.
I'm not sure that changes the judgement about the compression ratio and running on regular-grade, but it does mean you might need to take the difference into account when comparing things internationally.
-soD