$60,000, which I presume is USD, buys one hell of a lot of avgas especially when you consider the difference between the avgas cost and the cost of JetA1 for the same flight time.
What TBO are they giving for the diesel engine?
I'd venture to suggest the Lycoming IO540 will have a higher TBO and lower direct operating costs and overhaul costs.
Why anyone in this part of the world would even consider a diesel C182 beats me. As for retro fitting, it ain't going to happen.
Also the elephant in the room is the turbo reliability.
Apparently both engine failures during test flying were turbo related. Turbos have been fitted to aircraft for many many years now and have very good reliability. To have 2 engine failures with this engine suggests to me the turbo on this engine may not have the reliability we are used to in our aircraft. To follow on from that, a turbo failure in a spark ignition engine doesn't usually end in engine failure like it does so often for a compression ignition engine.