The national average price of a gallon of regular unleaded gasoline fell 4.6 cents to $2.353 for the week ending June 20, according to federal data.

The price of gasoline is now 45.9 cents lower than it was a year ago. For the week, it fell in eight of the nine categories tracked by the U.S. Energy Information Administration. The average price fell most sharply in the Midwest, where it shaved 9.6 cents from last week's price to $2.37. It increased slightly in the Rocky Mountain region, rising eight-tenths of a cent to $2.33.

The national average according to AAA reached $2.332, and fuel prices have fallen for nine consecutive days.

"Crude oil remains relatively less expensive than recent years which is contributing to direct savings at the pump," according to AAA's release. "Drivers are saving a nickel per gallon on the week, but are paying five cents per gallon more on the month."

Meanwhile, the average price of diesel fell five-tenths of a cent to $2.426. Diesel is now 43.3 cents lower than it was a year ago.