The weekly average price of a gallon of regular gas is $3.65, down 4 cents from a week earlier, according to the Department of Energy. This price is 30 cents lower than a year ago.
For the first time in a decade, gas prices went down in the month of March, according to AAA.
"It is very unusual for gas prices to decline in early spring like we have seen this year," said AAA spokesman Avery Ash. "An increase in refinery production and lower oil prices in early March have combined to provide rare falling prices for motorists in comparison to recent years."
On average, gas prices in 2013 are expected to be lower than last year.