The Obama administration set the first-ever greenhouse gas emission limits for US cars Thursday. To meet them, gas mileage standards must increase 40 percent to 35.5 miles per gallon.
Officials say 35.5 m.p.g. rule will cut foreign oil demand, lower greenhouse gas emissions, and save drivers money.
The new regulations on fuel economy and tailpipe emissions announced Tuesday are 'part of a far larger effort,' he said.