Ethanol has been used as a fuel for over 100 years. Henry Ford believed ethanol from agricultural waste could power vehicles. While ethanol fell out of favor due to cheap gasoline, interest has renewed due to concerns over foreign oil dependence and air pollution. Ethanol has a higher octane rating than gasoline and burns cleaner. It is produced domestically across the U.S., mostly from corn, and could help meet federal renewable fuel mandates. However, politics influence the ethanol industry as advanced biofuels seek to extend and expand federal support to encourage further development.