It all boils down to thermal efficiency, if you are getting 50 MPG on gasoline @ $3.00 per gallon, and then start using E85 which gets you 35 MPG instead, at about the same price, where is the benefit? And do not forget that horsepower goes hand in hand with thermal efficiency, and the reason we love motorcycles has to do with the horsepower to weight ratio (acceleration). Also the cost of the retrofit so that your vehicle can burn the corn has to be put into the equation.
I know my bikes would not run worth a crap on the cornholio anyway.
Let us drill Alaska!