“What I Learned Today” With Jeff Smith — Ethanol Isn’t The Bad Guy

I left some E10 in an open tin in my garage overnight. Next morning, water globules in the bottom. Re-did the test next night, same thing. E fuel is hygroscopic. Since your carb fuel bowl {& some fuel tanks} are vented to atmosphere, you may get corrosion. I didn't want to take the risk, so don't use E fuel in my vintage car.