My 2 cents worth is this. Ethanol added gasoline would seem to attract more condensation inside the gas tank, but during weather conditions where there is a large temperature change if the vehicle is not driven for long periods of time. So if you are storing a classic car over the winter months, you should consider putting in a gasoline stabilizer to minimize this and keep the gas tank close to full and prevent rusting inside the tank.
Gas golf carts have plastic tanks so rust inside the tank is not a concern. I put a gas stabilizer in my last tank of gas in my golf cart and shut off the gas valve and run the engine till it stalls when I put the cart away for a period of time when I go north to visit family.
So in answer to the question, my opinion, not necessary to purchase the ethanol free gasoline if you treat the gasoline for the longer non-use periods.
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