Have a read of my octane post from 2008 on UKGSer.
There's various ratings...
RON Research Octane Number as used in UK/Europe
MON Motor Octane Number.
AKI Anti-Knock Index which is an average of RON and MON and is the number used in USA.
91 octane in the States is roughly the same as 97 octane in the UK.
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and enlarges the world in which you live," Irving Mather (1892-1966)
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