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Some proponents of US energy independence promote wider use of alternatives such as ethanol fuel, methanol, biodiesel, plug-in hybrids and other alternative propulsion. A 2013 report published by the Fuel Freedom Foundation said that without a shift to domestic feedstocks for fuel, such as natural gas and biomass, the US would not be able to achieve energy independence. As of 2014, the United States imposes an import tariff of 54 cents a gallon on ethanol fuel (there is no such import tariff on oil or methanol fuel). Ethanol fuel in Brazil is produced from sugarcane, which yields much more fuel per acre than the corn used for ethanol production in the United States.