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That's it, I'm just gonna go back to wedge shaped combustion chambers. Because clearly combustion chamber shape has no effect on thermal and/or mechanical efficiency. Nor does rod to stroke ratio, bore size, injection type, ring sealing capability, chamber cooling, egr, scavenging, piston cooling, oil viscosity, pumping and parasitic losses, and compression ratio. Clearly all engines are exactly the same barring the swept volume of the pistons. And brake specific fuel consumption isn't actually a measurement of how efficient an engine makes power from the fuel it's consuming, and thus the air it's consuming by virtue of the air fuel ratio. Is just a bullshit phrase thrown around by people.
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