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Ethanol just plain doesn't vaporize as easily so cold temps with a cold engine affect startability. Note that it can be bitterly cold, as in below 0F, and a warm engine will run perfectly on E85 even a non-FFV. For example if I'm doing a 300+ mile trip in bitter winter cold I can fill up early on in the trip with E85 and burn that down just fine, then I top off with regular so the next cold start is uneventful.
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