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I agree we need to understand what is going on. We could do a before /after test on engine heat rejection, if less heat is going out the radiator or exhaust then we should be able to quantify it too. doing this would be a bit complicated though.
If you consider the combustion chamber temperature, and particularly the valves and piston, in normal operation will be hot enough to make some stream. There was a design once for a steam engine with internal steam generation, cylinder head was heated and a thin gap was created radially in the head that injected water was forced into by the "compression" stroke and turned instantly into steam. I think there could be a bit of this happening.
Of course, the engine is cooled in the process.
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