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Lucy Siegle went to Worcestershire to meet One Show viewer Helen Garnett. Helen drives a lot of miles and was spending £320 a month on petrol for her 4x4. So she's had herÌývehicle converted to run on liquified petroleum gas (LPG) and saved approximately £140 on fuel costs in a month.

Ìý LPG is also known as propane. It's a by-product of the extraction of natural gas and refining crude oil. Although LPG is a fossil fuel it generates 20% less CO2 than ordinary petrol, so it's also greener.

According to the UKLPG you can save up to 40% on your fuel costs if you switch from petrol to LPG because the tax on it is lower. It costs around £1600 and takes three to four days to convert the average car to LPG. Converting a vehicle does have its risks, so it's important that you use an .

Around 150,000 vehicles currently run on LPG in Britain but that figure is on the rise. 12,000 people convert to every year. This year that figure is set to double.

Have you converted your petrol vehicle to run on LPG? Did you make savings? What's your experience?

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