I had LPG installed on my car last year. For the fuel prices in my part of Europe, I calculated it would pay for itself in less than 10,000km. LPG is lot simpl

I had LPG installed on my car last year. For the fuel prices in my part of Europe, I calculated it would pay for itself in less than 10,000km. LPG is lot simpler than CNG or Hydrogen as the fuel can be stored at room temperature in liquid form at relatively low pressures. The tank pressure is around 10 bar / 150 psi, which is not much more than your home water supply. CNG is around 200 bar and hydrogen around 500 bar.