Higher sales of vehicles with smaller engines, gasoline-electric hybrids and diesel powertrains helped boost the average fuel economy of 2012 new vehicles sold in the United States 1.2 mpg to 23.
Higher sales of vehicles with smaller engines, gasoline-electric hybrids and diesel powertrains helped boost the average fuel economy of 2012 new vehicles sold in the United States 1.2 mpg to 23.