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Gasoline with ethanol, E10, is said to be expired after 90 days. Alcohol attracts moisture and it is this attracted moisture that causes the issues. There is no additives that can stop the alcohol from attracting moisture and therefore there is no better alternative than burning the fuel you buy and keeping the tanks fresh.

There are numerous articles written about ethanol but nothing I have read ever mentions a way to keep E10 fuel fresh other than burning it in a few months. Ethanol can attack the rubber compounds in your hoses and fuel lines and also the O rings in your fuel system and the plastics and fiberglass in your fuel tanks. Nothing you can ad can stop this.

We can buy water separators and additives but nothing is better than keeping fresh E10 fuel in your tanks and using it all before refilling the tanks. If you can still by straight gasoline with no ethanol you are well advised to do so as it has a much longer shelf life.