On the surface, it appears as though E15 ethanol-blended fuel, commonly thought to cause substantial harm to all vehicles built before 2001, is here to stay. The U.S. Supreme Court decided not to hear arguments against the Environmental Protection Agency's approval of E15 this summer, and legislative attempts to suspend the sale of E15 have stalled in the U.S. Congress. Yet the EPA now seems on the verge of backing off its push to add more ethanol into the American fuel supply, and a recent Associated Press report has scrutinized the ethanol mandates for causing more harm than good.

Much of the recent discussion on ethanol has centered around the so-called E10 blend wall, essentially the inability of U.S. oil refiners to add any more ethanol to the U.S. fuel supply.

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