If you watched the Video, they already have it in use, and 4500 km on one take of fuel, as they stated.
The fella is an engineer and designed Formlua 1 race car engines.
But I am sure you took the time to watch the video before you decided to make your negative assumptions.
You just keep paying for $50 fillups.

At least someone is trying to be innovative and come up with a clean solution, or alternative one. What is your contribution?