LPG is a liquid gas by-product of petroleum refineries. It is stored in tanks at a pressure of 6-8 bar.
During refuelling, if a filler neck is used, the dead man's button must be pressed for the duration for safety reasons. As with natural gas, the vehicle can only be operated with LPG with a cooling water temperature of 30 degrees. To reach this minimum temperature, the LPG vehicle needs fuel (approx. 1/2 litres) to start. Vehicles equipped with an LPG system are therefore only available as bivalent versions, i.e. with gas and petrol operation.
How much is LPG - and how expensive is the conversion?
LPG costs between 50 and 60 cents/litre and is thus considerably cheaper than CNG. However, due to the lower energy content of LPG compared to natural gas, consumption is around 20% higher than a petrol car. Nevertheless, the range of an LPG car is greater than that of a vehicle running on natural gas.
The reason is the lower energy density of natural gas, which results in smaller tank quantities for the same tank size. When converting to an LPG system, an approach that is more popular than buying new, the LPG tank is installed in the boot. The cost of converting to LPG can be up to €3,500 depending on the vehicle.