The national average price of a gallon of regular unleaded fell three cents to $2.51 following the Thanksgiving holiday, and has been getting cheaper for the past 10 days, according to AAA.

On Nov. 27, drivers could find gasoline that was cheaper than $2.50 per gallon at less than 63% of the stations. For the week, 49 states are paying less than they were a week ago, while Hawaii and Washington, D.C. drivers are paying one cent more. Prices have fallen between one and 15 cents across the country.

"AAA expects to see gas prices trend cheaper through the year-end, decreasing as much as 20 cents for some motorists before year-end," said Jeanette Casselano, AAA spokesperson.

The states with the largest weekly decreases include Indiana (15 cents), Ohio (12 cents), Illinois (10 cents), and Michigan (10 cents). States with the least expensive gas include Alabama ($2.23), Mississippi ($2.24), South Carolina ($2.24), Texas ($2.26), Arkansas ($2.27), and Oklahoma ($2.27).

Meanwhile, the average price of a gallon of diesel increased 1.4 cents per gallon to $2.926, which is 50.6 cents higher than a year ago.