The national average price of a gallon of regular unleaded fell 2 cents to $2.59 on higher supply as many states also saw cheaper prices for the week ending Nov. 18, according to AAA.

The price level is now 6 cents lower than a month ago and 3 cents cheaper than a year ago.

"An increase in gasoline stocks amid robust demand helped to push gas prices cheaper on the week," said Jeanette Casselano, AAA spokesperson. "We would expect this trend to continue throughout most of the month, but the exception is Thanksgiving. With nearly 49.3 million Americans expected to travel by car for the holiday, gas prices may start to fluctuate by the end of this week."

The Thanksgiving holiday is typically the busiest travel day of the year, so prices could move higher in the short term. About 49.3 million travelers will drive for the holiday, which is the most since 2005 and 2.8% more than a year ago, according to AAA. Much of the congestion will happen on Wednesday, Nov. 27.

The recent lower gas prices have motivated millions of Americans to take road trips, according to AAA.

Among the states, several saw a weekly price decline of 9 cents or more.

States with the largest weekly changes include Delaware (down 9 cents), California (down 9 cents), Ohio (up 9 cents), Michigan (down 8 cents), Kentucky (down 6 cents), Oregon (down 5 cents), Maryland (down 4 cents), Indiana (down 4 cents), North Carolina (down 3 cents), and Texas (down 3 cents).

States with the least expensive gas now include Louisiana ($2.21), Mississippi ($2.21), Texas ($2.24), South Carolina ($2.26), Alabama ($2.26), Missouri ($2.28), Arkansas ($2.28), Oklahoma ($2.28), Virginia ($2.30), and Tennessee ($2.31).

Meanwhile, the average price of a gallon of diesel fell one-tenths of a cent to $3.074, which is 20.8 cents lower than a year ago, according to the U.S. Energy Information Administration.