Gas conversion!? T5, 2.4i, 2.4 or 2.0D

Good evening, as the overhang already says, it is about the purchase of a new V50. At the moment we drive a V50 2.0D and a V40. The V40 has to be abolished soon and thus becomes room for a new one. Now the question, which is best if you consider a possible gas conversion. I have already selected from some posts the individual advantages/disadvantages. But is a lot of point of view… But what would you advise? With a garden & landscape architect n in the house the car is a lot on the road and so each year about 40T- 45T km come together. Does one somehow have an invoice, or also recommendations whether the surcharge of the T5 compared to the 2.4(i) is worthwhile. Or if it would not be cheaper to take a diesel. Is the additional consumption of a T5 compared to a 2.0D not so strong that it would not be worthwhile again? In addition, the conversion costs of approx. 2.6 – 2.9T EUR… On the other hand, the steur savings are (how much?). nice if you could give me tips and let me share your opinion. Thank you and a lively discussion…