There are plenty of people that will give you the "gas is for barbeques" line but once I got new plugs and leads for my V8 it never had a problem on lpg, in fact it ran just as well as petrol.  If you do the math I think the V8 on lpg was cheaper to run than a Tdi getting high km from a full tank, only you had to fill up the lpg twice more than the diesel.  Put some sill tanks on the V8 though and you'd have more range which I would have done if I had not sold it (the person buying it will probably do that), or you could have the lpg tank in the boot and take up most of your boot space but this just was never an option for me so I made sure I bought an lpg Disco with lpg scuba tanks under the back floor instead.  
I bought my V8 with a good lpg system installed already, but I would not have paid that much money to have one installed if I didn't already have it, I'd just run it on petrol and pay less for the car in the first place...hypothetically of course 

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