Surfrider77
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Different octane measurement methods are used. In the US we average RON and MON at our pumps, while in most other parts of the world - including most of Europe and Middle East - straight RON is displayed, which produces octane ratings about 4-6 higher for the same type of fuel. A 97 octane (RON) equals about 91-93 octane (R+M/2) around here.
Interesting to know. Thanks!