Introduction to LPG
This page should help you to understand how LPG is used to run an engine, the benefits, and some of the choices you need to make.
Liquefied Petroleum Gas (LPG) is a clean and safe fuel that has a range of properties closest to petrol. It is a by-product of petrol refining and natural gas production. Under slight pressure, LPG turns into liquid form and can then be stored in tanks. LPG is converted back to gas before being burned in the engine.
The main advantage of converting to LPG is its low price (around half that of petrol). The government has reduced the duty on LPG (or Autogas) in recognition of its unique clean burning properties that significantly reduce vehicle emissions. The duty advantage of LPG in 2013 was about 40p/litre (compared to petrol), reducing by just 1p/litre/year.
LPG reaches the engine in a pure gas form, resulting in improved combustion and eliminating the problem of engine oil dilution by unburned petrol. The oil stays cleaner for longer. This increases engine life and can extend service intervals. Engines also run more smoothly and quietly than on petrol.
Think about these environmental savings too!
A diesel engine produces about 20 times as much NOx as an LPG engine, thus having a huge impact on air quality.
A diesel engine produces about 120 times as many ultra-fine particulates as an LPG engine. These nasty little particulates lodge in your lungs and cause respiratory problems that tend to build up over the years.
A petrol engine produces around 20% more CO2 than an LPG engine.
Three really good environmental reasons for choosing LPG, in addition to the fact that LPG is cheaper than petrol and diesel when comparing the cost per mile for fuel.