including the purchase cost of NGVs (OEM, converted, or bi-fuel vehicles) compared with gasoline/diesel vehicles, natural gas fuel price at the pump compared with gasoline/ diesel, profitability of operating refueling stations, and selling/installing vehicle equipment, can affect consumer and investors’ decisions to enter the NGV market. I general, the mere existence of OEMs did not seem to be major factor in determining the success of NGV markets; seems that the availability and reliability of vehicle technology and components were far more important factors for consumers’ acceptance of NGVs.