I'm also pretty sure I've read before that "factory" lpg conversions were only offered on the K series engines and not the KV6. I bought my ZT V6 180 auto with a BRC kit already installed which initially worked well, although it's non-operational at the moment. I'm planning on re-commissioning it soon. It's correct that the efficiency of lpg is less than petrol and hence the mpg is less. I get a fairly steady 29 mpg on petrol overall (with no particular concession to an economical driving style) and when it was working I calculated that on lpg it was 24 mpg. However, the half price of lpg does definitely make it worth having and I reckoned that the overall fuel cost of running the car on lpg was pretty much equivalent to the cost running a diesel engine.
I have a 60 litre "toroidal" lpg tank in the spare wheel well. The boot is big enough to make carrying the spare wheel loose not too inconvenient most of the time.
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