Quote:
Originally Posted by sierra
The higher octane allows the engine to run at higher power per unit of fuel which is why the higher octane get more MPG than the the lower octane in an engine designed to use high octane.
High[more] octane = higher power and better[more] MPG.
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Again, higher octane rated gas does not contain more octane than lower rated gas. The higher number signifies its ability to resist premature ignition, aka knock. It has nothing to do with the amount of octane in the gasoline.
It's all about the compression ratio. Octane booster for example doesn't add octane, it increases the RATING of octane by raising the point at which it ignites, that's all. How much can I compress this gasoline before it ignites? 87? 89? 91? 93? Boom! No extra octane.
Just use wiki if you still don't know, or any of the various websites that will tell you the same.