New York City's public transportation network is the most extensive in North America. About one in every three users of mass transit in the United States and two-thirds of the nation's rail riders live in New York and its suburbs. Data from the 2000 U.S. Census reveals that New York is the only locality in the United States where more than half of all households do not own a car (the figure is even higher in Manhattan, over 75 percent). While nearly 90 percent of Americans drive to their jobs, mass transit is the primary form of travel for New Yorkers.[1] As a result of New York's uniquely high rate of public transit use it is one of the most energy efficient cities in the country. Gas consumption in New York, for example, is at the rate the national average was in the 1920s.[2]