FYI If you have gas powered generators, chainsaws, weed whackers.. Use Aviation gasoline. It stays free of gumming for many years.. No Alcohol. No Butane. If you want to see the difference put a few ounces of each in a Styrofoam cup. AVGAS will not dissolve STYROFOAM. costs more, but it's worth it in the long run. Pete WA4EIO