Interesting. The Conti Grand Prix results were indeed opposite. However, with the Primos w/ground off tread, latex rolled slightly easier at 140 PSI, and slightly worse at 100 and 120. I guess they should put an asterisk with all these test results of *YMMV.

For touring purposes, I can't imagine it even matters. If I was a pro racer, however, I would probably want every possible advantage I could get.