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Maybe the higher pressures move the deflection more to the tread rather than the sidewall, and thus the results of more resistance at more pressure.
I've never gone beyond 50psi, for fear of a blowout, which would negate the advantages of over-inflating from an economic and environmental point of view, especially for me since 1 tire would be 10% of my annual fuel budget. This data makes it much harder to justify the risk of the higher tire pressures vs the efficiency gains.
I appreciate all the effort taken to get this data, but I wonder how did you come across so many tires?
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