As the holidays approach, many people in the United States will be glad to know gas prices are falling. Virginia is following the national trend. The state’s average gas price is $3.23, and Charlottesville’s average is $3.16. The national average per gallon of gasoline has decreased almost 10 cents in the last month, according to the Oil Price Information Service. The national average Monday for the price of regular gas was reported at $3.38, a 4-cent decline from the previous week’s $3.42 and a 10-cent decline from the $3.48 reported in the beginning of November. A yearly changeover to a winter-blend fuel that is less expensive to produce accounts for the falling prices, according to an NBC29 report.