I ran across the following Merc website which deals with ethanol fuel in the marine industry. There is also a 50 minute presentation by Merc engineers. I found it quite informative.
http://www.mercurymarine.com/servic...-maintenance/faqs/outboards/?category=ethanol
http://www.mercurymarine.com/servic...-maintenance/faqs/outboards/?category=ethanol
