Romney's position on federal mandates that require gasoline producers to include ethanol in gasoline blends has been less clear. The Romney campaign responded to a survey question asking for Romney's position on ethanol use mandates by saying the ethanol industry "has made important strides in reducing America's dependence on foreign oil" and ethanol "should continue to have prospects for growing its share in transportation fuels." Romney wrote to the American Farm Bureau Federation, "The increased production of biofuels plays an important part in my plan to achieve energy independence. In order to support increased market penetration and competition among energy sources, I am in favor of maintaining the Renewable Fuel Standard."