I'm curious about how this is fuelled
Whether it uses conventional(ish) automotive diesel, or is a diesel cycle engine running something like CNG or LNG. I have a liking for CNG, to the extent that I'm researching building a car to run it, and it offers excellent performance for an engine that is optimised for it.
Major disadvantage is it's storage volume is quite large for it's weight, which means filling up the baggage space in an R66 with fuel tanks instead of engine......
CNG will also require access to reasonable supplies, which is why it's widely used as an automotive fuel in developing countries without oil but reasonable gas reserves. Since CNG is methane (settle down, the smell comes from other additives that YOU put in it) it can actually be generated naturally and to a certain extent sustainably.
Oh stop sniggering!