Quote:

There was a time when octanes around 92 were considered Regular.



At that time a different formula (Research Octane Number) was used to calculate the octane rating.

Another common formula is the Motor Octane Number, usually 8-10 points lower than RON.

Using the current formula (R+M)/2 on the old 92 (RON) regular would get you 87.

Contra todo mal, mezcal; contra todo bien, también