The average price of a gallon of regular-grade gasoline fell 7 cents nationally over the past two weeks, to $2.62.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the drop comes as flooded refineries continue to come back online after devastation caused by Hurricane Harvey.
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Lundberg says she expects prices will continue to fall in the next few weeks.
Gas in San Francisco was the highest in the contiguous United States at an average of $3.18 a gallon. The lowest was in St. Louis at $2.19 a gallon.
The U.S. average diesel price is $2.51, down 2 cents from two weeks ago.