Thanks for the post and link. The results seem to confirm my subjective observations about the benefit of latex tubes --- which seem very hard to find in the size tires I ride. The other advantage of latex tubes is they are less susceptible to pinch flats at lower pressures. Of course, rolling resistance is not the only factor to consider when evaluating a tires relative performance, the other factor is suspension loss, which is a function of tire width, suppleness, and pressure. Here again, performance will favor both tubeless and latex as they favor wider tires at lower pressure. I just ordered a pair of 35 mm Compass Bon Jon's. When I return to my NH dirt and gravel roads, I'll set them up tubeless; but for now, I'm anxious to see how well they perform on high speed group rides in South Carolina vs, my 28 mm Conti 4000 II s's. The Conti's have Vittoria latex, but for convenience I will set up the Bon Jon's with Schwalbe light butyl tubes.
One other thought about tire performance. The boys from Bicycle Quarterly claim that tires run at higher pressure subjectively feel faster because they are more likely to transmit high frequency road vibration, than tires run at lower pressure which dampen these vibrations. The vibrations make you think that you are going faster. Of course, Bicycle Quarterly is a sister company of Compass tires whose main sales angle is softer wider and more supple tires. None the less, I've read thier reports and field tests. While not exactly scientific or unbiased, they seem to be at least trying to be impartial. Any way, I'll be doing my own subjective tests on the Bon Jon's in a few weeks.