The difference between CNG and LPG cars is storage pressure, with CNG at 10 times the pressure with 20-25 MPa vs 2 MPa for LPG. LPG has a higher energy content so a much greater cruising range with the same size tank. There are many more LPG dealers, too.
The biggest difference between CNG and LPG cars is the fuel itself. CNG is methane and LPG is propane and/or butane. One of the other key differences between CNG and LPG cars relates to energy density. CNG-compressed natural gas storage has a lower energy density than LPG. This means you typically lose more boot space with CNG because you need a larger tank capacity to offset the difference in compressed natural gas storage. Even with this, you may still have a reduced cruising range.
Another difference between CNG and LPG cars is the tank pressure. LPG pressure is less than 2 MPa whilst CNG-compressed natural gas storage is 20 to 25 MPa. This means high-pressure CNG tanks are heavier and more expensive than LPG tanks. The state-of-the-art direct liquid injection is only available in LPG, providing a potential performance advantage over CNG.
You should also check local fuel availability before choosing, as it may vary between the two fuels. Petrol and diesel vehicle owners contemplating conversion to CNG and LPG should also be aware of the advantages. Both LPG and CNG are much cleaner fuels than petrol or diesel.
They both have fuel systems that are sealed. This avoids any leakage or evaporative losses. Both CNG and LPG also have lower maintenance costs, including greatly reduced fouling of the spark plugs.
Jiaxing Lineng Autogas Equipment Co., Ltd., as a CNG Emulator manufacturer, can provide you with a high-quality LPG CNG switch and other parts. You are welcome to come to consult at any time: https://www.lnautogas.com/product/emulator/