The average price of a gallon of regular-grade gasoline fell about a penny nationally over the past two weeks, to $2.31.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the drop comes amid plentiful supplies of both crude oil and gasoline.
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She says gas prices have declined more than 15 cents since April.
Gas in San Francisco was the highest in the contiguous United States at an average of $3.00 a gallon. The lowest was in Jackson, Mississippi, at $1.92 a gallon.
The U.S. average diesel price is $2.51, down 2 cents from two weeks ago.