And therefore obviously this is not an unbiased control group. Perhaps the more recent teslas have slightly better/less used brakes? Have they controlled for th

And therefore obviously this is not an unbiased control group. Perhaps the more recent teslas have slightly better/less used brakes? Have they controlled for that? There are countless ways in which such conclusions can be flawed. Statistics is really tricky, even with very large samples at recent presidential election had shown that beyond any doubt.