Tom, you have 15% Ethanol mixes? As far as I knew there was only the standard 10% mix and E85 for ethanol.
One of my professors (as far as I know) is one of the leading ethanol backers in the U.S. and has had to cancel class in order to speak before the house/senate in D.C. to push U.S. use of ethanol. My school is one of the main testing facilities for ethanol use (the Prius project was apparently a bit difficlt... some rubber bits did give way). He is always really busy but I am going to try to pose some of these issues to him when I can to see what the real deal is. We had to study this stuff and I am positive that he has real reliable answers to most of these questions. I hope I can get a minute of his time.
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-Aaron
SVX: '92 Dark Teal 101k
'97 Legacy GT Wagon: dead
'99 Civic Si: daily driver... stolen and stripped with all my tools!
'92 Yamaha FZR 600: garage
2011 Jetta: Daily disappointment