Fuel taxes may act as an incentive for the production of more efficient, hence less polluting, car designs (e.g. hybrid vehicles) and the development of alternative fuels. High fuel taxes may provide a strong incentive for consumers to purchase lighter, smaller, more fuel-efficient cars, or to not drive. On average, today's automobiles are about 75 percent recyclable, and using recycled steel helps reduce energy use and pollution.[34] In the United States Congress, federally mandated fuel efficiency standards have been debated regularly, passenger car standards have not risen above the 27.5 miles per gallon standard set in 1985. Light truck standards have changed more frequently, and were set at 22.2 miles per gallon in 2007.[35] Alternative fuel vehicles are another option that is less polluting than conventional petroleum powered vehicles.
