Industry analyst Trilby Lundberg said Sunday that the price is 37 cents per gallon under its year-ago point.
Lundberg says the price drop may continue if crude oil costs continue to slide.
In the Lower 48 states, the highest average price of regular gasoline was $2.62 per gallon in Los Angeles. The lowest was $1.44 in Tulsa, Oklahoma.
The U.S. average diesel price is $2.13 per gallon, down about 7 cents from two weeks ago.