It is important for everyone to know about the harmful effects of ethanol as it is applicable to all small engines. This of course includes all makes and models of mills running gas engines. If you can help it, you do not want to run ethanol through a small engine, especially one that has plastic components (fuel tank). Ethanol is corrosive and will actually degrade the plastic inside of the tank, gradually gumming up the works. Even though the fuel you're getting from the gas station might say ethanol free, because it is all shipped in the same trucks, lines, and pumps, there is always a bit of cross contamination. I once spoke with a chemist who told me that they tested all of their local gas pumps labeled ethanol free and found that all of them had at least 2% ethanol, versus the 10% at the ethanol pumps. So even if you are buying ethanol free gas, it isn't. Either way you're going to end up needing some sort of additive. There are a lot of different products out there claiming to fix the problem, and they range widely in price. One of the best ones I have found is called Star Tron Enzyme Fuel Treatment. It comes in a blue bottle, costs only a few dollars, and treats up to 48 gallons of gas. Since I started putting it in every tank I have not had any more issues with gumming up. Sawdust can be an issue if I don't stay on top of my fuel filters, but that's another subject entirely.