A sign with gas prices is shown at a gas station Monday, July 1, 2013, in Hialeah, Fla. Gasoline prices are on a summer slide, giving U.S. drivers a break as they set out for the beach and other vacation spots for the Fourth of July. (AP Photo/Alan Diaz)

Associated Press
A sign with gas prices is shown at a gas station Monday, July 1, 2013, in Hialeah, Fla. Gasoline prices are on a summer slide, giving U.S. drivers a break as they set out for the beach and other vacation spots for the Fourth of July. (AP Photo/Alan Diaz)
A sign with gas prices is shown at a gas station Monday, July 1, 2013, in Hialeah, Fla. Gasoline prices are on a summer slide, giving U.S. drivers a break as they set out for the beach and other vacation spots for the Fourth of July. (AP Photo/Alan Diaz)
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