The average U.S. price of a gallon of gasoline has jumped 18 cents over the past two weeks.

That’s according to the Lundberg Survey of fuel prices, released Sunday, which puts the price of a gallon of regular at $3.69.

Midgrade costs an average of $3.83 a gallon, and premium is at $3.95.

Of the cities surveyed, Denver has the nation’s lowest average price for gas at $3.07. San Diego has the highest at $4.24.

In California, the lowest average price was $4.05 in Fresno. The average statewide for a gallon of regular was $4.18.