FILE - In this Tuesday, Jan. 10, 2012, file photo, John Mendel, executive vice president of sales for American Honda unveils the 2013 Honda Accord Coupe concept during the North American International Auto Show in Detroit. New cars and trucks sold in the U.S. last year got an average of 23.6 miles per gallon in combined city and highway driving, a record that came mainly through improvements to engines and transmissions, according to the Environmental Protection Agency on Thursday, Dec. 12, 2013. (AP Photo/Carlos Osorio, File)