Liquefied gas (gasoline). Synonym: diesel gas. It is obtained from wet natural gas by the gasoline process. Liquefied natural gas, mined together with oil, is called "wet" gas” due to the content of liquid hydrocarbons, which can be extracted as gasoline by distillation. It is a liquefied mixture of the three lightest components of natural gas: propane (25%), Butane (45%) and isobutane (30%). The calorific value of LPG is approx 11 400 inch/kg. All three components of LPG are chemically related to gasoline, and differ from it under normal conditions of temperature and pressure in consistency. Calorific value (calorific value) it is one of the basic properties of both LPG and other propellants. It is the source of the engine's power (fuel energy), which determines the performance of the engine's work. The octane number is an index of the knock resistance of the engine, caused by pre-ignition. Pre-ignition causes a loss of power and rapid engine wear. The octane number is measured using the laboratory method with reference fuels and a special laboratory engine. Vapor pressure, as a property of liquid fuels, is determined using a special apparatus, the so-called Reid bomb. LPG is one of the gases with the highest calorific value. It is used for specially prepared carburettor engines. Maybe” also be used for blends, as a component for regular gasoline. It is used in car mixtures as a flammable admixture in order to start engines faster at low ambient temperatures. It is also used for heating purposes. LPG is used in construction for some types of trucks. Average wear rate 21,33 m3 100 km mileage. Liquefied and closed in tanks, in tanks or in cylinders, can be stored and transported even over longer distances. The best way to store LPG is in underground tanks, in which, thanks to the insulating effect of the ground, it only slightly heats up and increases its pressure even in the most hot weather.