We have gone far afield of this thread .... the BMW Hydrogen 7 comes to mind... using the 760Li engine and directly igniting the hydrogen in its internal combustion engine, unlike its competitors innovations.
[not to mention it burns petrol like crazy]
So this is why my German auto dealership gets $175./hour to open the hood? I knew there was a good reason. ;-D
I once took on the task of doing a light restoration of a 92 750iL.
Never again. :P