this post was submitted on 06 May 2026
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[–] RandomStickman@fedia.io 17 points 3 hours ago

In Canada, The United States, and Mexico, the advertised octane rating is the average of the RON and the MON, called the Anti-Knock Index (AKI). It is often written on pumps as (R+M)/2. AKI is also sometimes called PON (Pump Octane Number).

Because of the 8 to 12 octane number difference between RON and MON noted above, the AKI shown in Canada and the United States is 4 to 6 octane numbers lower than elsewhere in the world for the same fuel.

There's a table in the wiki article that shows the equivalence of different systems

https://en.wikipedia.org/wiki/Octane_rating