Good news at the gas pump -- gasoline prices fell more than 6 cents per gallon in the past two weeks, according to a survey of about 7,000 gas stations nationwide. The Lundberg Survey's average nationwide price of a gallon of self-serve regular fell 6.4 cents per gallon, to $2.15 per gallon, said publisher Trilby Lundberg. Prices are likely to fall further before leveling off, Lundberg said.