[aerohead]

1) Motoring the engine with the dyno to establish FMEP does not duplicate the actual stresses and strains ( mechanical and thermal ) of firing tests.
2) So, FMEP as reported as derived from imep minus pmep is inaccurate, casting the accuracy of the test results into question.
3) FMEP must be calculated as about equal to pmep + ramep.
4) pmep is registered from the gauge for exhaust and intake strokes.
5) ramep ( rubbing & accessory mep ) from (mechanical friction & accessories).
6) ramep increases almost linearly with speed and maximum combustion pressure.
7) pmep is independent of compression ratio, and increases with speed, almost as the square of the speed.
8) Friction horsepower increases at about the square of the speed.
9) The engine's mechanical efficiency @ idle= zero!
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10) In modern automotive engines, there is no friction savings at idle to be had, as the 'stop-start' function removes this aspect of operation.
11) Automotive engines aren't 'driven' at IDLE.
12) To 'load' an engine at idle constitutes a 'SEVERE' operating condition.
13) All of Logic's 'supporting' evidence appears to be derived solely from 'SEVERE' tribological conditions, as Dr. Erdemir has commented; rather than 'normal' driving conditions.
It's the elephant in the living room.