The average U.S. price of regular-grade gasoline dropped 9 cents per gallon (3.8 liters) over the past three weeks, to $2.84.
Industry analyst Trilby Lundberg of the Lundberg Survey says Sunday that lower crude oil prices contributed to the drop at the pump.
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The price is 17 cents lower than what it was a year ago.
The highest average price in the nation is $3.94 a gallon in the San Francisco Bay Area.
The lowest average is $2.27 in Baton Rouge, Louisiana.
The average price of diesel fell by 4 cents since May 17, to $3.12.