Water is heavier than gasoline, and water will separate from gasoline (like oil and water). If that small amount of water is sucked into the fuel injectors, it won't burn. That's why you added the de-icer stuff to the non-ethanol gasoline, to mix with the water and burn it without stalling the engine. But I don't think you ever added enough de-icer to bring the total up to 10%.
So, you shouldn't need to add de-icer to your fuel if you're using 10% ethanol.
Outside ethanol-mix fuel countries, standard operating procedure for years was a tiny amount (a bottle cap or so) of denaturated alcohol (the stuff you burn in Trangia stoves) every other tank or so in cold weather.
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