(CNN) -- Gas prices have plummeted 46 cents a gallon over the past two months, according to a survey released Sunday.
"This has been a true price crash," said Trilby Lundberg, publisher of the Lundberg Survey.
The average price of a gallon of regular gasoline is $3.38, down nearly a dime over the past three weeks, Lundberg said.
"This crash began back when refining problems around the country were being fixed, one after the other, at the same time that our seasonal gasoline demand was shrinking," she said.
Crude oil prices have also dropped after having risen steadily.
Prices at the pump should drop even more in the coming days, as refiners cut how much they're charging distributors and retailers, Lundberg said.
The national average is about 8 cents higher than the average a year ago.
The survey tallies prices at thousands of gas stations nationwide.
Long Island, New York, had the highest average in the latest survey, at $3.85. The lowest average was in Memphis, Tennessee, at $3.04.
All across East Tennessee, gas prices slipped as well, according to the latest numbers from AAA. Drivers in Maryville even saw the average price of a gallon fall below the three dollar mark to $2.998.
In Bristol, prices fell over nine cents in the last week alone, but still remain higher than every local city except Johnson City ($3.257).
At $3.07, Knoxville drivers paid a nickel less per gallon than they did last week.