Gasoline prices have climbed 12 cents over the past two weeks, CNN reports, citing findings from the Lundberg Survey.
It was less of a jump than the previous two weeks, when the price climbed 18 cents, said publisher Trilby Lundberg.
The average price of a gallon of self-serve regular is now $3.81, CNN reports.
CBS News reports Denver has the nation's lowest average price for gas at $3.36 among the cities surveyed. Los Angeles has the highest at $4.35.
"Gasoline prices would like to peak soon because there is too much gasoline supply versus demand," Lundberg said, "except on the West Coast due to refinery maintenance projects."
CNN reports Lundberg said gas prices are up 31 cents from the average last year.