A common misconception (one that

A common misconception (one that I’ve had at one time, as well) is that using higher octane gas will give you better gas mileage and better engine performance.

This, of course, is a fallacy – and if you have a low compression engine, it can actually deteriorate your engine’s performance.

I found a great webpage that discusses the specifics of how gas octane rating can affect the performance of engines designed for street driving