Conclusion
Beyond the direct beneficiaries—corn growers and ethanol producers like Archer Daniels Midland—the ethanol mandate retains some supporters. For example, those who place a high value on the national security benefits of producing domestic ethanol to supplant oil imports have largely shrugged off the difficulties. But for a growing number of people, including some who had supported the mandate, the many problems, trade-offs, and unintended consequences have proven too great to ignore. Even those who see benefits have to ask themselves whether they are outweighed by the costs.
Before the costs get any higher, it is time for Congress to rethink its approach. If repeal of the mandate is not possible, freezing ethanol use at current levels would at least help to prevent additional harm while the nation reassesses its renewable fuels policy.

http://www.heritage.org/Research/Ene...ent/wm1879.cfm