Compressed Natural Gas vehicle is an alternative fuel vehicle that uses Compressed Natural Gas as the fuel rather than gasoline or diesel. CNG, or compressed natural gas, is stored at high pressure, 3,000 to 3,600 pounds per square inch (21 to 25 MPa). The required tank is more massive and costly than a conventional fuel tank. The CNG vehicle's emissions are cleaner, with lower emissions of carbon and lower particulate emissions per equivalent distance traveled. There is generally less wasted fuel. For...