I run a car here in the UK which is on LPG gas.
The cost savings were what attracted me to this plus prior experience of it in Australia where as other have said it is a well established alternative fuel for vehicles.
Initially looked at doing the home brew bio diesel however when you did the sums it was too expensive compared with LPG. Even with the current waiving of fuel duty on home production / own use bio diesel.
Home brew bio diesel might have been OK before too many people started chasing the used chip oil. Once everyone wants something it is no longer a waste product you can just take away. It has now become a product to be sold to the highest bidder. Also with bio diesel you only have access to it at home. Once away from there you are back to petrol station prices.
I do about 250 miles a week and previously did this in an Mercedes A class manual 1.6 litre 4 cylinder petrol. Have swapped it for an automatic 4.6 litre v8 Range Rover on LPG. Fuel cost in real life driving over the same journey is about the same. Have driven on LPG then petrol however cannot tell the difference.
LPG tank replaced spare tyre so keep dual fuel capability if needed and no loss of interior carrying space.
Was concerned as most seem to be about my ability to locate a LPG filling station when away from home. Filling stations are not as common here as in Australia. Problem has been solved though as a list of all UK mainland filling stations can now be down loaded from the internet and put into your sat nav (Check before purchasing sat nav as not all brands are supported). This listing even includes price and opening times and is updated about every 2 weeks. Drove to the highlands of Scotland for a weeks holiday and even up there gas was viable as it was available in even the smallest village.
Downside is that there is no standard filling connection in Europe. Go to Southern Ireland and the connector is different. Believe there are 3 types in Europe just depends on the country you are in.
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