[island911]

"An engine is essentially an air pump."

I cringe when ever I hear/read that. I know what you're saying but...

First there is the importance of fuel/air mixing and the control of the chemical kinetics. --the "bang" produced is of utmost importance.

Second, what you are talking about is limiting torque losses (preserving MEP) at higher rpm ... which comes back to the chemical kinetics.

Overall I agree with you that the HP claim on pump gas, naturally aspirated and 10:1 CR is dubious. I expect that their secret is that they are lying about the HP number, or lying about the work-around. Perhaps fuel used and CR. Perhaps it's unsustainable steady state /cooling.