Here in illinois, I have been running E85 for the last 2 years. Before that, I never ran it myself so the last 2 years is all I can speak for...
They have not been changing E85 to E70 or anything like that over the winter. I have asked the stations I used and they told me no. I have never actually tested, but I have seen no change in my A/F or blown up my engine from too much timing. The only time I have ever seen it tested, was a guy with a EVO at the station and his results were E93.. this was well into spring. So I personally have no suspicion that they are cutting it during the winter, at least here around me
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