Is it not time for something new and interesting for Rob. Treadmill accuracy tests require a Rob ter Horst to find out which is the most accurate among the many treadmills which are on the market:

https://www.google.ch/search?q=treadmill&lr=&sca_esv=581345929&tbm=isch&sxsrf=AM9HkKkl62bi6mqDf5sBulzgRvWYWWTafw:1699653486379&source=lnms&sa=X&ved=2ahUKEwj-1K_StrqCAxUjxAIHHTmuD0gQ_AUoAnoECAIQBA&biw=1760&bih=850&dpr=1.09

Here is how to start with:

https://petergamma.org/category/treadmill-calibration/