The final solution™ is of course the electric car, which is approaching with some velocity. I have no dog in the fight over ethanol but have mixed emotions about Senator Grassley. He has tried to keep farm subsidies to be only for family farms, unsuccessfully. On the other hand he made taxes worse for Americans who work in other countries. We are now one of only two countries in the world that tax their citizens who live and work in another country.
And then there is MTBE which has ruined a few aquifers. It ain't coming back.
https://en.wikipedia.org/wiki/MTBE_controversy