Published: May 22, 2011 9:06 PM EDT
Updated: May 22, 2011 9:07 PM EDT

CAMARILLO, Calif. (AP) - The average U.S. price of a gallon of gasoline has dropped about 9 cents over the past two weeks.
 
The Lundberg Survey of fuel prices puts the average price for a gallon of regular at $3.91.
 
Analyst Trilby Lundberg said Sunday that the national average for a gallon of mid-grade is $4.05. For premium it's $4.16 a gallon.
 
Lundberg says diesel prices fell about 8 cents a gallon over the past two weeks, to $4.14.
 
Jackson, Miss., had the nation's lowest average price for gas at $3.60. Chicago had the highest at $4.38.