I have spent thousands on his tires and have tested tires in many ways. I currently use a coast down somewhat similar to Jan's method and I also use Rchung application to tease out the real world Crr. One aspect of Jan's testing clearly biases his results towards fat tires-the speed of his tests. The fastest that he tests is 18 mph and usually much slower around 15 mph. Most of my riding is closer to 30 mph. This data is a full year of riding including PBP, posted for those who will call BS. I mount a 23 mm on the front wheel and a 25 mm on the rear, GP5000 with latex tubes.

One myth is the assumption that Crr is a constant. It is not. If anyone does careful testing at higher speeds, it becomes quite apparent.

Another myth is the rolling resistance tests on a drum are close to real world values, although at 20 mph the relative rankings match my testing. In other words, if tire A is better than tire B on the drum, those results are consistent but these rankings can swap at higher speeds.