The average price of a gallon of regular-grade gasoline dropped 7 cents nationally over the past two weeks, to $2.32.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the drop reflects lower costs for crude oil.
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She says the national average is 4 cents a gallon below the price a year ago.
Gas in San Francisco was the highest in the contiguous United States at an average of $3.06 a gallon. The lowest was in Charleston, South Carolina, at $1.91 a gallon.
The U.S. average diesel price is $2.53, down 3 cents from two weeks ago.