The Georgetown University Art car of Mazda is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

BMW i8, the Green Luxury car of the year awarded by Green Car Journal, is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

A Mini Cooper is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

The e-Golf of Volks is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

US Secretary of Energy Ernest Moniz speaks during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

The Sonata hybrid of Hyundai is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

Ford 2015 F-150, the Green Tech Car of the year awarded by Green Car Journal, is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

Mustang presented by National Capital Region Mustang Club are showed during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

The exhibition hall of Toyota is seen during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

Jeep Grand Cherokee, the Green SUV of the year awarded by Green Car Journal, is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)

The Lexus RC F is presented during the second press day of 2015 Washington Auto Show in Washington D.C., capital of the United States, Jan. 22, 2015. (Xinhua/Bao Dandan)