What is the octane rating of fuel? The octane rating of fuel is an indicator of just one thing: the fuel’s ability to resist detonation or knock. That’s it. The octane number has nothing to do with ...
The answer is yes: You can mix 87 and 91 octane gasoline without blowing your engine to hell. With that out of the way, let's discuss what mixing different octane fuels does to your engine in terms of ...