The average price of a gallon of regular-grade gasoline jumped 3 cents nationally over the past three weeks to $2.54.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the increase is due to higher crude oil costs.
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The current gas price is 16 cents above where it was a year ago.
Gas in San Francisco was the highest in the contiguous United States at an average of $3.22 a gallon. The lowest was in Tucson, Arizona, at $2.10 a gallon.
The U.S. average diesel price is $2.94, up 6 cents from three weeks ago.