2 ms·
There are two measurements that can be made; RON (Research Octane Number, measuring fuel behavior at 600rpm) and MON (Motor Octane Number, measuring fuel behavi
by stickydink 13y ago
There are two measurements that can be made; RON (Research Octane Number, measuring fuel behavior at 600rpm) and MON (Motor Octane Number, measuring fuel behavior at 900rpm).
MON is typically 8-10 points lower than the RON.
In the US/Canada and some other parts of the Americas, they use the average of the two. Hence lower.
In most other places, they just use the RON.
http://en.wikipedia.org/wiki/Octane_rating#Measurement_methods http://en.wikipedia.org/wiki/Octane_rating#Measurement_metho...