U.S. Senators Roger Wicker (R-M.S.) and David Vitter (R-La.) have introduced legislation to block an increase in the amount of ethanol that can be blended with gasoline. The bill would overturn Environmental Protection Agency (EPA) waivers that allowed gasoline containing 15 percent ethanol (E15) to be used for many passenger cars and light trucks, and would prohibit the agency from granting future waivers for any blends above 10 percent ethanol. More