In the past few years, I have written a lot of columns about octane ratings. However, the questions I receive indicate there is still a lot of confusion as to what the ratings systems are and their relationship to each other.
Many people do not realize that the octane rating of a fuel is not a physical property of the fuel, like specific gravity or pour point. It is a performance perimeter that gives a rating for the fuel under very tightly controlled lab conditions.
How that fuel will perform in the real world under a variety of conditions is another matter. [Read more…]