[quote author=Niallyboy link=topic=4587.msg49034#msg49034 date=1197658096]
The RON ratting in the USA is differen't
91RON(USA) = 95RON aprox (or something like that)
93RON(USA) = SUL 97RON aprox [/quote]
That's right, only they call it the octane number in the US and Canada, not the RON rating. It's an average of the RON and MON figures, so usually 4-5 units lower than the RON.