CAMARILLO, Calif. (March 11, 2013)--The average price of a gallon of gasoline has dropped six cents over the past two weeks, the first decrease in gas prices since late December, according to the Lundberg Survey of fuel prices, which reports the price of a gallon of regular is $3.74.

Midgrade costs an average of $3.91 a gallon, and premium is $4.04.

Diesel was down four cents to $4.13 gallon.

Of the cities surveyed in the lower 48 states, Billings, Mont., had the nation's lowest average price for gas at $3.31.

Los Angeles had the highest at $4.23.