(Undated) -- Gas prices are lower than they've been in more than four years. The nationwide average for regular is two dollars and 72 cents a gallon. The Lundberg Survey of hundreds of stations across the U.S. says that's down 12 cents in the past two weeks, and a dollar below the national average in early May. Drivers in Albuquerque are paying the lowest average price of two-38 a gallon. Gas prices in Canton are not much more than that, at $2.43 a gallon at Casey's along North 5th Avenue, at USCO it was $2.44 and at BP along South 5th Avenue and at the Circle K BP on South Main it was at $2.43 this morning. The most expensive place to fill up in the country is San Francisco, where regular averages three-04 a gallon.