The U.S. average price of gasoline dropped 27 cents over the past three weeks, to $2.44 a gallon.
Industry analyst Trilby Lundberg said Sunday that the pump price fell even though crude oil prices gained strength, as gasoline supply outweighed demand.
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Further price drops are likely if crude oil prices don't skyrocket, because the Sept. 15 change to winter grade gasoline comes with a cost cut in much of the country.
The cheapest price recorded in the continental United States was Charleston, South Carolina, at $1.94.
The highest was $3.31 a gallon in Los Angeles.
The national average price of diesel was down 9 cents over the past three weeks to $2.63 a gallon.