Proposed federal mandates for ethanol and advanced biofuels under the federal law requiring certain levels of renewable fuels to be blended with gasoline seem to have few supporters and many critics.
The U.S. Environmental Protection Agency announced on May 29 its proposed targets for cellulosic biofuels, biomass-based diesel and advanced biofuels to be blended with gasoline for 2014-2016 under the Renewable Fuel Standard (RFS).