It’s been quite sometime since we could say that gas stations around Colorado have gas for under $2 a gallon with no promotion or special going on, but it’s happening now!. According to the AAA, a gallon of regular unleaded gasoline in Colorado $2.90 a gallon on Tuesday (Jan. 7), and the U.S. average was $3.06. However, there is at least one spot where you can find gas for under $2!