Major biofuel proposals in Congress

Bigger ethanol mandate: A Senate energy bill would increase the amount of ethanol and other biofuels that refiners are required to use to 15 billion gallons by 2015 and 36 billion gallons by 2022. The House is developing similar legislation.

Higher ethanol blends: Ethanol producers say conventional cars should be allowed to run on gasoline with more than 10 percent ethanol. That would require altering federal environmental regulations and changing auto industry warranty practices.

End the subsidies for corn ethanol: Groups representing cattle, hog and chicken producers as well as meatpackers want to abolish the subsidy for corn ethanol and a tariff on imported ethanol.