I've never had a problem I could directly link to ethanol. I never had a serious problem other than reduced milage in my 944. Fortunately I don't have 10% around here, but the highest octane is 92. I have never put ethanol in the 987 that I know of, but the hygroscopic nature could be a good explanation. I have been hearing more cases of huge amounts of water in gas at stations. If dry gas helps than that could be the problem.
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