The average price of a gallon of regular-grade gasoline jumped 7 cents nationally over the past two weeks to $2.58.
Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the spike is a result of several factors, including higher oil prices.
The current price is 32 cents above where it was a year ago.
Gas in San Francisco was the highest in the contiguous United States at an average of $3.25 a gallon. The lowest was in Baton Rouge, Louisiana, at $2.14 a gallon.
The U.S. average diesel price is $2.82, up 6 cents from two weeks ago.