Where they come up short in the second analysis - at least according to the engineers at Zipp is that after a certain point of inflation, there is no more lessening in rolling resistance. I had a long discussion with them trying to decide the tire pressure (tubeless) I wanted to run my Zipp 999 wheelset at for racing time trials. I had been running about 145 lbs. According to a study made, I am waisting arm motion pumping beyond about 120 psi.