And what, pray tell, was the average price of a gallon of gasoline on 1.20.01??

Gas prices hit "a milestone mark" today, according to AAA, reaching "$4 a gallon for the first time." The Average price for regular unleaded rose 1.7 cents to $4.005, up from Thursday's record high of $3.989. Prices "are nearly 29% higher than the $3.105 average a year ago."

• Think Progress