Frankly, I don't understand the concern re ethanol in gas. The ONLY issue I have seen in many years of having ethanol in the fuel is that you do NOT want to leave it in the tank/system for lengthy periods of non-use, like winter storage, UNLESS you add fuel stabilizer. I drain my Norton's fuel tank/carbs for long term non-use; on my other bikes/any cars stored for winter I add stabilizer.
Been doing this for as long as there has been ethanol in gasoline with no issues whatsoever. One car is a 1989 model so pre-ethanol in gas as far as the fuel system is concerned. It often sits unused/unattended for up to 6 months (battery disconnected) with "normal" ethanol gas/stabilizer. It starts immediately as if it had been running yesterday upon reconnecting the batt/hitting the starter. None of the vehicles - cars or bikes- have ever required any "service" due to ethanol; none have had any fuel system problems due to ethanol. Heck, my wife's '03 Mercedes sat unattended for almost a year in '14 with stabilizer (battery disconnected) and started with no issue.
NOW, if you want to talk about the cost/benefit/environmental sense of making ethanol from corn just to add to gasoline, that's a different issue!
FWIW - Re fiberglass tanks/ethanol - I bought a new Fastback tank from Burton Bike Bits back around 2011. They said it was made of resin that could handle ethanol. Despite that, for my own comfort level before its first filling, I used Caswel sealer on the tank. It has shown no sign of any problem. Whether the tank resin or the sealer (or both) is responsible for having no problem, I can't say. Whether the fact that the tank had never seen any fuel in it before sealing it made the sealer work better, I can't say either.