There was no mention in the Kazius YouTube demos of how much energy he was pouring into the ambient field in which the test tube was standing/burning. That he could take the flame and convert it to mechanical motion using a small Stirling engine does not answer the question of energy cost (or energy density).

The other point that should be repeated is that aside from sources of energy, efficiency comes from moving energy across time and space efficiently. Solar panels can't drive a car in real time, but they can harvest energy all through daylight hours and store it. Hell, all oil is is a highly efficient way to move solar energy through time and space.


A