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.

 

That's according to the Lundberg Survey of fuel prices, released Sunday, which puts the price of a gallon of regular at $3.32.

 

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.

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