(1) LPG was previously used as a fuel in the automobiles, however nowadays it is CNG that is widely used. Methane is the chief component of CNG while LPG consists of propane, butane and other chemicals.

(2) An LPG-fuelled vehicle did not run on CNG as both fuels are different from each other as they have different calcrific values. They also need different air-fuel ratios for combustion.

(3) You can retain the petrol carburettor during the conversion of your vehicle to CNG.  It is done so that your car still runs on petrol once you run out of CNG. The dashboard contains a switch that allows you to shift from CNG mode to petrol mode and vice versa.

(3) The savings on fuel cost by using CNG depends on various factors such as size, fuel consumption characteristics and mileage of the vehicle.

(4) You can occasionally use petrol as it serves to lubricate the carburettor in addition to improve the performance of the engine.

(5) CNG is a safer fuel than petrol, diesel or LPG as its specific gravity is lighter than air and that allows it to rises up and dissipates in the air. The ignition temperature of CNG is 700 degree Centigrade as compared to 455 degree Centigrade for petrol. Also, the storage of CNG is much safe than petrol, as the designing and construction of CNG cylinders are done from special materials and with high safety specifications.

(6) CNG is filled with a maximum pressure of 3000psi/g in a cylinder.

(7) The CNG kit is durable to boot and is easy to service. It is recommended to have optimum efficiency regular checks after every 10,000 km.

(8) In addition to petrol engines, the diesel vehicles can also be converted to CNG. In fact, majority of the public transport in metros are converted from diesel to CNG.