The average price of a gallon of regular-grade gasoline increased by 7 cents nationally over the past three weeks to US$2.65.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the increase is due to higher crude oil costs.
The current gas price is 34 US cents above where it was a year ago.
Gas in San Francisco was the highest in the contiguous United States at an average of US$3.42 a gallon. The lowest was in Tucson, Arizona, at US$2.26 a gallon.
The U.S. average diesel price is US$3.04, up 5 US cents from three weeks ago.-AP