The average price of regular gasoline in the United States has dropped more than 11 cents over a three-week period to $2.72.

That's according to the national Lundberg Survey of fuel prices released Sunday.

Analyst Trilby Lundberg says the average price for a gallon of mid-grade was $2.86. Premium was at $2.97.

Jackson, Miss., had the lowest average price among cities surveyed at $2.43 a gallon for regular. San Francisco was highest at $3.10.

Diesel was at $3, up 9 cents from three weeks ago.

In California, the average price for a gallon of regular dropped about 2 cents to $3.03.

Bakersfield had the state's least expensive gas, at $2.95 a gallon.