Originally Posted by
bbbean
Even smooth roads aren't as smooth as a good track. That contact patch is stil doing a lot of conforming to variations in the surface. But as I said, you don't have to take my word for it, do the reading. Try it out for yourself with a power meter and tire pressures at 5 psi intervals.
The rollingresistance.com website doesn't use a smooth roller AFAIK and generally speaking, the higher the PSI, the less rolling resistance for almost any tire you look at.