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Ave $5 per gal. KOCH, SUNOCO, VP...don't know about on-line purchase. Alky is cheaper but not well suited for cold weather--you can run it in cold weather but won't get the same HP advantages.
I go to the local sunoco station down the street from my house and get a 5 gallon drum for 35 dolllars, then if you bring the drum back they give you a 10 dollar core so it is really only 25 dollars--- also the fuel is great----