Environmental Protection Agency Administrator Lisa Jackson, right, accompanied by Transportation Secretary Ray LaHood, gestures while speaking to reporters in the White House briefing room in Washington, Tuesday, Sept. 15, 2009, about a plan by the Obama Administration to require better gas mileage for new cars and trucks and tougher rules on vehicle greenhouse gas emissions. AP Photo logo AP Photo 29 months ago

Environmental Protection Agency Administrator Lisa Jackson, right, accompanied by Transportation Secretary Ray LaHood, gestures while speaking to reporters in the White House briefing room in Washington, Tuesday, Sept. 15, 2009, about a plan by the Obama Administration to require better gas mileage for new cars and trucks and tougher rules on vehicle greenhouse gas emissions.