The average U.S. price of a gallon of gasoline has dropped about 7 cents over the past three weeks.

The Lundberg Survey of fuel prices puts the average price for a gallon of regular at $3.41.

Analyst Trilby Lundberg said Sunday that the national average for a gallon of mid-grade is $3.57. For premium it's $3.69 a gallon.

Lundberg says diesel prices fell 5 cents a gallon over the past three weeks, to $3.73.

Jackson, Miss., had the nation's lowest average price for gas at $3. Chicago had the highest at $3.78.