I don't disagree with any of the previous comments, but here are some observations on the issue from the frozen North.
10% Ethanol is generally not a problem in a larger capacity engine which is run regularly, whether a car, truck or tractor. However, Mercedes (and perhaps other high-end vehicle manufacturers) advise against using Ethanol "enhanced" fuels. Caveat emptor!
Just for fun, if you put one gallon of gasoline with Ethanol in a clear container, add a cup of water, shake it up and let it settle. You end up with Ethanol-free gasoline above a layer of water/Ethanol. Such is the affinity of Ethanol for water, (and which is the root cause of everybody's problems). If you actually measure the quantity of water added and then measure the settled layer after extracting the Ethanol, then you can see the amount of Ethanol removed.
As for the the Iso Propyl Alcohol, that works fine, but the cheap stuff might be "wet" meaning it's diluted with water, thereby reducing it's effectiveness at de-watering the fuel. Simpler to buy gas line de-icer from your local auto store. Comes in a 6 pack of small sealed bottles. Dump one into the tank every 2-3 fills and away goes any issue with difficulty with small amounts of water in the fuel system. Any significant amount of water in the fuel system will tend to freeze around here and good luck when that happens! Waiting until Springtime is one method. Prevention is highly recommended.