There could be more presents under the tree this year for U.S. drivers, with gasoline prices plummeting to their lowest levels in 2.5 years. The national average price for a gallon of regular gasoline in the United States was $3.087 as of Friday, according to data supplied by AAA. This compares with #3.193 a year ago today, and is the lowest level since June 2021, right before gasoline prices began their climb to $5 per gallon, which it hit the following summer. This drop in gasoline prices could offset high inflation for consumers, Bloomberg…