CAMARILLO, Calif. (AP) — After months of dropping, gas prices are back on the upswing.

The average U.S. price of a gallon of gasoline has surged seven cents in the last three weeks, according to the Lundberg Survey of fuel prices, which puts the price of a gallon of regular at $3.32.

Pump Patrol: Find the cheapest gas near you.

Midgrade costs an average of $3.50 a gallon, and premium is $3.63.

Diesel remained unchanged at $3.96 a gallon.

Of the places surveyed in the lower 48 states, Salt Lake City has the nation’s lowest average price at $3.04. Long Island, N.Y. has the highest at $3.75.

In California, the lowest average price was $3.46 in Sacramento and the highest was $3.65 in Bakersfield. The average statewide for a gallon of regular was $3.59, up a dime.

(Copyright 2013 The Associated Press.)