Other references, including photo proof:
http://www.floridasportsman.com/2012/07/02/ethanol-and-old-outboard-boat-engines/
http://www.fidosysop.org/1204/06/e-15-ethanol-gas-blend-coming-and-could-harm-your-engine/
http://www.rifleandrod.com/2012/07/ethanol-fuel-can-ruin-boat-motors/
Associated picture: http://www.rifleandrod.com/wp-content/uploads/2012/07/DSC0021.jpg
http://www.pensacolafishingforum.com/f67/my-ethanol-issues-118496/
Also, I have had to retire my former daily driver classic Honda motorcycle and buy something 20 years newer due to e10 gasoline constantly screwing up the carburetors by causing varnish and crap build up (among other problems) in them necessitating constant rebuilds. It has literally cost me thousands of dollars; this stuff is CRAP and the sooner it goes away the better.
100 LL AVGAS my friend. Take a 5 gallon jug to the little local airport and get it for your airboat.