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CNG (Compressed Natural Gas) is a gaseous fuel consisting of a mixture of hydrocarbons, mainly methane.

Natural Gas is compressed to a pressure of 200 to 250 bars, to form CNG - Compressed Natural Gas.

Colourless, odourless, non-carcinogenic and non-toxic, CNG has a limited flammability range and is lighter than air. It is not a liquid fuel, and is not the same as LPG (Liquefied Petroleum Gas), which consists of propane and butane in liquid form. Superior to petrol, it operates at nearly no cost of conventional fuel in Iran and hence CNG is increasingly becoming popular with automobile owners. Commonly referred to as the green fuel because of its lead free characteristic, it reduces harmful emissions and is non-corrosive, thereby

enhancing longevity of the life of spark plugs. Another practical advantage observed in countries where CNG is already in vogue is the extension of life of lubricating oils as the fuel does not contaminate and dilute the crank-case oil.