Hmm I hear this cons against a pure ethanol powered engine. Lets remember a few facts abotu it that seem to be getting over looked. Current gas engines need a 14 to 1 air to fuel ratio, alcohol needs 7 to 1, you are correct that you need 2 times as much fuel to run
Not true
Current gas engines target mix at "14.7:1" air to fuel ratio, pure alcohol target mix is 9:1 E85 is 10:1