[Lazarus]

I've raced with tubes and with Stans tubless. We ran at 45+ psi just like everybody else. No wonder I sucked.

There was a noticeable increase in rolling resistance with the same tire at 25 PSI then at 50 PSI. The big advantage was in flat protection and weight. You could take lines that were not available with tubed tires and the Stan were a little lighter which makes a big difference. I think this is like EPA testing. It's great in the lab but does not translate to real world mountain bike racing. If you look at most MTB race course there not real technical and mix in a lot of hard pack and jeep trails with a few rocky technical spots to keep it interesting. Depending on design of the tire, fat 2.0 vs skinny 1.85, at the end of the day usually the higher the PSI the faster. YMMV