Originally Posted by Carbonfiberboy

This is correct. The Strava estimated power is meaningless, being based solely on speed, as you said earlier. He could have had a brake dragging on one test, Strava would say power was the same. That said, a quick trip over to BRR says that at the same comfort level, i.e. 4.5mm drop for both tires, RR is .1 w less for the 32 per tire. At recommended pressures, 15% drop, it's .7w higher for the 32, per tire. There's also the aero component. If someone wants to do the calculation we could see the theoretical time difference. The OP doesn't mention tire pressures, a significant omission. And all that said, these are pretty neat tires. I haven't gotten cut #1 yet on our tandem.