Woman pumping gas

The national average price of gasoline has hit exactly $4 a gallon, approximately a dime below its all-time high. According to a Lundberg Survey of fueling stations released on Sunday, pump prices rose 12 cents over the past two weeks. On July 7, 2008, the national average price of gas soared to $4.114 a gallon, a record-setting high, according to data from the U.S. Department of Energy.

If you're hunting for bargain gas, and willing to drive to get it, then Tucson, AZ offers you the lowest average price among cities surveyed at just $3.62 a gallon. Meanwhile, drivers in Chicago suffered the most, having to dish out an average of $4.50 for a single gallon of the go-juice.

The U.S. Department of Energy will release its weekly survey of diesel and gasoline prices on Monday afternoon. Who's willing to bet that prices will have come down by then?