LPG Conversions

April 11, 2013 By Mike Lee
Last updated on July 27, 2015

Introduction To LPG Conversions
We’re basically including LPG for those who want to add it to their pride and joy to keep the costs down, as well as reducing their emissions a little. Bear in mind that a car with an LPG conversion will still require petrol on start up and for a mile or two after to let the engine warm up before switching to LPG. This is important, because if you use it from cold the gas could freeze and course problems.

LPG (Liquid Petroleum Gas) is produced from butane and propane and although is seen as an alternative fuel source is however mostly a by-product from the extraction and oil refining process. LPG can also be produced from natural gas fields.
LPG Bottle

LPG cars retain a standard petrol tank and then need another tank for the LPG, which is why they’re known as dual fuel/bi fuel. Therefore you will lose space with the addition of the LPG tank, unless you get one that sits where the spare wheel does, then you lose the spare wheel.

Most towns and cities will have a garage that sells LPG (there’s about 1300 in the UK), but it’s not always easy or convenient to drive to them. It costs around half that of petrol, but you lose around 20-25% fuel efficiency and there’s sometimes a very slight power loss. Also there’s extra weight from the fitted system and tank.

The cost involved of installing the systems vary, but look at between £1000-£2750 depending on your vehicle. Note: some cars can’t be converted.

Alloytec V6 LPG engine 2006-2008 Holden VE Commodore
Alloytec V6 LPG engine 2006-2008 Holden VE Commodore

You will have to inform the DVLA and your insurance company if you do have one fitted. Talking of insurance, most companies will require installation to be carried out by an LPGA Approved Installer.


  • Vauxhall at one point produced 80% of all factory LPG cars
  • The cleanest LPG cars are also currently exempt from London’s congestion charge
  • At present no LPG car can travel through the Channel tunnel.
    Some garages may not work on a cars engine fitted with an LPG system

Hyundai V6 LPG Engine
Hyundai V6 LPG Engine

Just How Fast Can You Go On LPG?

First 9-second LPG pass