WASHINGTON – JULY 29: U.S. President Barack Obama pauses while speaking during an event announcing new auto fuel economy standards at the Washington Convention Center July 29, 2011 in Washington, DC. Joined by auto industry leaders and others, Obama announced a program aimed to further improving fuel efficiency in cars and light-duty trucks to 54.5 miles per gallon by the 2025 model year and will begin be phased in starting in 2017. (Photo by Brendan Smialowski/Getty Images)