100 Octane

[Jeff_SS]

Yeah I was gonna say this is at the station here.
$8.35/gallon

Just not gonna make a difference in a car tuned for 91...

[Mongo36]

Originally Posted by Rocky1974

I know, but most people don't really understand exactly what octane really is. They seem to think that it is the energy in the gasoline or something, when the opposite is true. The bottom line is that for maximum power you want just enough octane to prevent denotation and no more. Octane above what you need to prevent denotation will actually reduce power, but just slightly. I'd rather have too much octane than not enough. If you get too much, you will only reduce power slightly. Not enough could destroy your engine. But that's not likely on a modern computer controlled engine, with knock sensor feedback. On that type of engine, you normally just loose power.
The manufacturers try to make modern cars idiot proof, but sometimes, I don't think they don't realize the caliber of idiots that they are dealing with.

^^^
This man know what he is saying. Too many people think higher octane equals more power in the fuel. The higher octane rating shows the ability of the fuel to prevent "knock" or detonation.