The average price of gasoline has dropped 7 cents over the past three weeks to $2.22 a gallon for regular grade.
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Industry analyst Trilby Lundberg said Sunday lower oil prices and an abundant gasoline supply caused the decline. She says the price is 60 cents less than it was a year ago.
The Lundberg Survey found the average price of midgrade unleaded is $2.51 a gallon and $2.72 for premium.
The highest average price for regular gasoline in the Lower 48 is $2.83 a gallon in the San Francisco Bay Area. The lowest is $1.81 in Charleston, South Carolina.
The U.S. average diesel price is $2.39 per gallon, down three cents from two weeks ago.