Sure. I am mostly wondering about the demographics of Tesla owners. My guess would be that people who own Tesla cars tend to live in similar areas, with comparable lifestyle. There is also the case of driving style. I doubt there are people that tend to drive like my grandmother, and I would assume that a variety of driving style is important as well.

All I'm saying is that the claim of N million miles should be taken with a grain of salt as long as you do not know the entropy that these miles contain.