CNG, as we often refer to, in short, means converting a vehicle originally fueled by gasoline or diesel into one powered by natural gas.

 Currently on the market, most vehicles fueled by natural gas are converted from gasoline or diesel vehicles. 

During the conversion process, to maintain the versatility of the vehicle, the original fuel supply system is usually retained.

 The converted vehicle can use either gasoline or diesel, or choose natural gas as the fuel. Vehicles that cannot use both fuels simultaneously are called "dual-fuel" vehicles; 

while those that can use both fuels simultaneously are called "bi-fuel" vehicles. 

By using common quality CNG/LPG conversion kits to convert our vehicles, for example, diesel vehicles, after switching to natural gas, 

retain their original engine diesel fuel system and ignite natural gas by injecting a small amount of diesel into the cylinder.

 Such vehicles can achieve the simultaneous use of both fuels and are therefore called dual-fuel vehicles. They are also commonly referred to as CNG vehicles.