Article Photos: Natural gas drillers target US truck, bus market 1/3

  FILE - In this Thursday, Oct. 27, 2011 file photo, motorist Bob Davis fills up his airport shuttle van at a natural gas pumping station in College Park, Ga. Years from now, motorists needing a fill-up might see natural gas pumps sharing space at the neighborhood filling station with ones dispensing gasoline and diesel. (AP Photo/David Goldman, File)