FILE - In this Thursday, May 10, 2012, file photo, drivers navigate in a congestion of traffic at Copacabana in Rio de Janeiro, Brazil. In 2011, the U.S. became a net exporter of fuels

 

              FILE - In this Thursday, May 10, 2012, file photo, drivers navigate in a congestion of traffic at Copacabana in Rio de Janeiro, Brazil. In 2011, the U.S. became a net exporter of fuels
FILE - In this Thursday, May 10, 2012, file photo, drivers navigate in a congestion of traffic at Copacabana in Rio de Janeiro, Brazil. In 2011, the U.S. became a net exporter of fuels for the first time in 60 years. Mexico and Canada are the two biggest destinations for U.S. fuels, followed by Brazil and the Netherlands. (AP Photo/Felipe Dana, File)