V40 BJ 02 and LPG

Hello. Since I also have a V40 (165ps; Bj 2002; 185TKM) I think – synchronously of the rising interest prices – more and more often about LPG. Experiences about this? Is the conversion still worth 185TKM? According to the current survey of the driven KM relative to BJ and engine I can not get a clear picture. Too much are the wear differences in distance / city etc. So: What is a conversion cost about and which manufacturer is recommended? I consume approx. 8.5 – 9l /km and can calculate a payback with a driving performance of approx. 20-25KM/a (at approx. 10% extra consumption). Important would be a simple handling and a placement in the wheel pit. A few advices for me? markus.