A word to the wise: this thread is filled with a lot of significant misinformation. There are also some pearls of wisdom. Rather than go into which is which and start a flame war, I caution each of you to research on the web the following: Race fuel, AVGAS, White Gas, Coleman Fuel, Vapor Pressure, and Octane, specifically when used in 2 cycle applications. The motorcycle guys have been at this a lot longer than us, and have some very good articles out there.

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Roger