The average price of a gallon of regular-grade gasoline dropped 5 cents nationally over the past two weeks, to $2.41.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the drop reflected lower costs for crude oil, as well as abundant gas supplies.
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She says the national average is 14 cents a gallon above the price a year ago.
Gas in San Francisco was the highest in the contiguous United States at an average of $3.02 a gallon. The lowest was in Tulsa, Oklahoma, at $2.02 a gallon.
The U.S. average diesel price is $2.57, down 2 cents from two weeks ago.