(CNN) -- U.S. gasoline prices increased nearly 33 cents in two weeks, the second-biggest two-week jump in the history of the gasoline market, according to a new survey of filling stations.The latest Lundberg Survey of cities in the continental United States was conducted Friday. It showed the national average for a price of self-serve unleaded gasoline at $3.51, an increase of 32.7 cents from the last survey two weeks earlier, survey publisher Trilby Lundberg said.
