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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Not really. Higher octane is pointless for a lot of engines. Higher octane fuel helps reduce detonation in high compression engines, and allows more advanced ignition timing. In our engine if you use anything less than 91, you run the risk of engine knock, and significant premature wear.
Edit Add: the increase in MPG is marginal, and nowhere near the cost of the higher octane fuel.