Of all our research on tires, the most revolutionary finding is this: Tire pressure has almost no effect on a tire’s speed. The real revolution is not how you use your pump… What has totally changed our riding are the wide, supple tires, which only work because of this new insight. I’m not trying to prove you wrong…in fact, in general we are in pretty much agreement on the subject of tire pressures (Tis far better to err on the side of too little pressure than too much”).
The statistical analysis shows that we did pick up differences in tires (for the runs where we tested different tires) and not noise, showing that our methodology is sensitive enough to pick up small differences between tires. Our crab and shrimp are high acid and the canning industry is still working on an alternative to BpA free lined cans for high acid foods.
Tires can collapse, and supple tires will collapse more readily (and dramatically) than those with stiff sidewalls. As the evolution of motorcycles progressed (drums to discs, to advancements in suspensions, traction control, tire technology etc) so goes the MTB and so goes the road bike.
My concern with your method is that you have a huge number of variables: Speed, gearing, temperature, wind, rider heart rate, power output, tire pressure, position on the bike, the line you pick on the course, traffic passing, dirt on the road… and many others we may not even be thinking about.
Wild Planet aims to convert all of its canned products to cans with BPA-Free linings. To get the most benefit out of these lower pressures, you need supple tires. Lastly, and yes, for the tire pressure testing shown in that chart above, I did repeat at least one pressure (the 8bar results IIRC…it was quite a few years ago when I did that).