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
2002 Camaro SS, waiting for new turbo...
2005 Neon SRT-4, Big wheel stage 3, E85