CAMARILLO, Calif. (AP) — The average U.S. price of a gallon of gasoline has dropped three cents over the past two weeks.

The Lundberg Survey of fuel prices released Sunday says the price of a gallon of regular is $3.71. Midgrade costs an average of $3.88 a gallon, and premium is $4.01.

Diesel was down six cents to $4.07 gallon.

Of the cities surveyed in the lower 48 states, Billings, Mont., has the nation's lowest average price for gas at $3.33. Chicago has the highest at $4.10.

In California, the lowest average price was $3.87 in Stockton. The highest was in Los Angeles at $4.09. The average statewide for a gallon of regular was $4.03, down 12 cents.

Check out CBS13's Pump Patrol to find the cheapest gas.

Copyright 2013 The Associated Press.