Since ethanol is a required component in gasoline, critics of the tariff say lifting it would mean cheaper gas for everyone.
But others say ethanol makes up less than 10% of the nation's gasoline supply, and protecting a domestic energy source is more important than gaining what they say would be just a small savings on gas prices.
NEXT: Requiring utilities to buy renewable power
Last updated September 25 2008: 3:43 PM ET