[taneq]

This needs to be higher up. Likewise, a thermal cycle (Otto, Stirling etc.) doesn't get X% efficiency, an engine (running at a given hot/cold temperature with pumping losses etc) does.

Article says "The Stirling engine is capable of using roughly 50% of the energy it produces. An internal combustion engine, like the ones in our vehicles, uses about 14%." This isn't even wrong - the efficiency of both of these engines depends on a huge range of factors.