Autogas is the common name for liquefied petroleum gas (LPG) when
it is used as a fuel in internal combustion engines in vehicles
as well as in stationary applications such as generators. It is a
mixture of propane and butane.
Autogas is widely used as a "green" fuel as it decreases exhaust
emissions. In particular, it reduces CO2 emissions by around *5%
compared to petrol. One litre of petrol produces 2.3 kg of CO2
when burnt, whereas the equivalent amount of autogas produces
only 1.5 kg of CO2 when burnt.[1] It has an octane rating
(MON/RON) that is between *0 and **0 and an energy content
(higher heating value—HHV) that is between *5.5 megajoules per
litre (for pure propane) and *8.7 megajoules per litre (for pure
butane) depending upon the actual fuel composition.
Autogas is the third most popular automotive fuel in the world,
with approximately *6 million of **0 million passenger cars
powered using the fuel, representing less than 3% of the total
market share. Approximately half of all autogas-fueled passenger
vehicles are in the five largest markets (in ascending order):
Turkey, South Korea, Poland, Italy, and Australia.
