Maybe the higher humidity up there causes the issues, but down here E85 rules. I was just in a group conversation with one of the best LSx tuners in the country, NicD (who also tuned my SS), and he said E85 will make a little more power than C16.
2012 Focus Titanium
2001 Camaro SS, A4 - DD
2002 Camaro SS, down for rebuild, almost done...
2003 Neon SRT-4, Big turbo, E85 SOLD!