The average price of a gallon of gasoline nationwide 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 says 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.
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