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A natural gas vehicle (NGV) utilizes compressed natural gas (CNG) or liquefied natural gas (LNG) as an alternative fuel source. Distinguished from autogas vehicles fueled by liquefied petroleum gas (LPG), NGVs rely on methane combustion, resulting in cleaner emissions due to the removal of contaminants from the natural gas source.
Volkswagen Caddy/Caddy Maxi EcoFuel CNG (a camping car/van version also available as the Caddy Life Tramper EcoFuel CNG) Volkswagen Eurovan (Transporter) T4/T5 2,0 I4/3,2 VR6 BiFuel/EcoFuel CNG and TSI EcoFuel CNG (latter planned) (also LWB) Suzuki Mehran VX CNG BI FUEL Chevy Express Van CNG (Note, limited range ~130 miles/tank)
The power of wound-up springs or twisted rubber cords can be used for the propulsion of small vehicles. However this way of energy storage allows only saving small energy amounts not suitable for the propulsion of vehicles for transporting people. Spring-powered vehicles are wind-up toys or mousetrap cars.
The Honda Civic GX first appeared in 1998 as a factory-modified Civic LX that had been designed to run exclusively on CNG (compressed natural gas). In 1998 the Civic GX cost $4500 more than a comparable Civic LX. [10] The car looked and drove just like a contemporary Honda Civic LX, but did not run on gasoline.
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Still, CNG at typical pressures requires more frequent refueling because it contains only a quarter of the energy per unit volume of gasoline, [1] whereas LNG contains only 80%. Although natural gas is a finite resource and its reserves can be depleted, it is unique among current fuels in having a net positive EROEI (energy returned on energy ...
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Compressed natural gas (CNG) is a fuel gas mainly composed of methane (CH 4), compressed to less than 1% of the volume it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20–25 megapascals (2,900–3,600 psi; 200–250 atm), usually in cylindrical or spherical shapes.