Ethanol is acidic and corrosive... It is death to aircraft rubber fuel
tanks, many kinds of rubber seals, corrodes many metals, and is a bad
idea all around... They can't make ethanol fast enough so they will
resort to methanol, which is even more nasty...

But, don't let me stand in your way of knowledge... Do a search on
ethanol + corrosion and find out what I don't know...
cheers ... denny