What is LPG? (In brief)

LPG is an abbreviation for 'Liquified Petroleum Gas'.

There are two basic types of LPG, Butane and Propane. Propane burns the hottest.

LPG will become a liquid if compressed and become a gas again if decompressed.

How LPG compares with Petrol as a road vehicle fuel


Note that Petrol as a liquid does NOT burn!

It must be vapourised and mixed with air for combustion.

Petrol in its raw state has a relatively low 'Octane' rating. Lead and Benzine have been (or are) added to Petrol to increase its octane rating, both are harmful to the environment.

Burning Petrol results in the release of Carbon dioxide, Carbon monoxide, Sulphur dioxide, compounds made from Lead and Benzine to name just some. Burning of Diesel releases 'particulates' which have also proven to be harmful. This is NOT good for us or our world.

Petrol or Diesel (especially in Europe) is EXPENSIVE in terms of financial cost and environmental damage. They are not about to become cheaper in either respect. Soon there won't be any Petrol or Diesel left as reserves of crude are diminishing.


LPG as a liquid also does NOT burn.

Unlike petrol, LPG needs very little encouragement to vapourise and is more efficient.

The Octane rating of LPG is far higher than that of raw Petrol, thus no Octane enhancing additives are required. Just about all that is added to LPG is the smell!

In economic terms LPG is cheaper to produce and in environmental terms the burning of LPG is far less harmful. Many parts of your vehicle will last a lot longer if it is converted to run on LPG.

In brief, Petrol is a liquid (in the temperature condtions we live in) that can be made to vapourise and mix with air. LPG is a gas (in the temperature and pressure condtions we live in) that can be induced to change to a liquid state if compressed. LPG in is gaseous state will mix with air much more readily than Petrol.


There are small drawbacks to LPG conversion.

Empty LPG tanks must be bigger than their maximum capacity (they may only be filled to 80% ). As an LPG tank is a pressure vessel it must be made of much thicker material. These two factors combine to make them weigh much more than a Petrol tank.

Burning Propane produces less power (reaction) than Petrol. A vehicle will do less distance per litre or gallon of liquid when using LPG instead of Petrol. That said, you'll still save 50% of your Petrol costs (or more) if you run on LPG.

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