Hi Steve,
I can't help you out on which modern Volvo or which LPG system but one thing I would say on choice of LPG system, if you do go that way, is to look for a fully active LPG system. My reasoning is this -
After rebuilding my S40's LPG system (Necam / Koltec system with passive injectors) due to a progressively worsening LPG economy, I found that even though it's been setup with the correct pressures it's inadvertently become slightly optimised for long motorway runs. I now get about 10% more miles out of a tank than even when the car was new. However, urban cycle is now slightly worse. It makes me think that a system that was better mapped/dosed at both ends would be a best of both worlds. As it is I think I have a single point of optimisation.
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