A sign advertising unleaded gas for $2.99 a gallon is seen at a QuikTrip station at the corner of Woodruff Rd. and Verdae Blvd. on July 1, 2013 in Greenville, S.C. (Associated Press)

Photo by: Rainier Ehrhardt

A sign advertising unleaded gas for $2.99 a gallon is seen at a QuikTrip station at the corner of Woodruff Rd. and Verdae Blvd. on July 1, 2013 in Greenville, S.C. (Associated Press)