The national average price for a gallon of regular unleaded fell 4 cents to $2.60 for the week ending Oct. 28, marking the largest one-week decrease in more than six weeks, according to AAA.

The current price is now 5 cents cheaper than a month ago and 21 cents cheaper than a year ago.

"On the week, more than half of all states saw gas prices decrease," said Jeanette Casselano, AAA's spokesperson. "A handful of Great Lakes and Central states saw the largest declines at the pump, while pump prices primarily increased in the West Coast and Rockies regions."

Refinery maintenance across the county has continued, yet utilization rates increased in the past week, which could lead to additional price declines in the coming weeks, Casselano said.

States with the largest weekly changes include Indiana (down 14 cents), Ohio (down 14 cents), Michigan (down 14 cents), Kentucky (down 11 cents), California (down 8 cents), Florida (down 7 cents), Alaska (up 7 cents), Nevada (down 6 cents), Illinois (down 6 cents), and Wisconsin (down 5 cents).

States with the least expensive gasoline prices include Louisiana ($2.23), Mississippi ($2.24), Texas ($2.25), Alabama ($2.27), South Carolina ($2.27), Missouri ($2.28), Arkansas ($2.29), Oklahoma ($2.29), Virginia ($2.29), and Tennessee ($2.30).