LPG conversion for EL wagon - pros and cons

[Way2go]

I'm looking at getting an LPG conversion done on our recently purchased EL Fairmont wagon, and was wondering what any of you have fitted in terms of systems, etc., and if anyone had experienced any real problems with such a setup. I'm looking at a system that always starts on petrol then converts to gas, so I expect that the tales of cold starting problems are usually avoided this way, but I'm notsure how many other problems you hear about are simply that (hearsay) or if there is any substance to them.

I've had 2 different quotes, one for an Impco system ($2920), the other for an OMVL system $2500). Is there really any difference between these 2 manufacturers and their systems? Which is better and why?

Also been hearing about this 'gas vapour injection' that is the newest technology around. One lot has said it can't be fitted to the EL 4.0, while another said he thought it could be but was another $1000. Is there really any benefit of this system - better fuel economy, less problems, etc.?

Looking forward to your responses.