Dual Fuel Vehicle Act of 2011 - Requires automobile manufacturers to ensure that at least 50% of 2014 and 2015 model year automobiles and light duty trucks manufactured for sale in the United States are dual fueled (capable of operating on alternative fuel and on gasoline or diesel fuel or a mixture of biodiesel and diesel fuel). Increases the minimum to 90% for later model years. (Excludes automobiles and light duty trucks that operate only on electricity.)