Also, the cohort that purchases Tesla vehicles may be a lower-risk group of drivers than average. This could happen because Tesla vehicles are more expensive t

Also, the cohort that purchases Tesla vehicles may be a lower-risk group of drivers than average. This could happen because Tesla vehicles are more expensive than comparable conventional vehicles, less attractive to those with risky lifestyles, inconvenient for people who don't have regular driving patterns that allow charging to be planned, or more attractive to older consumers who wish to signal different markers of status than the young go-fast crowd. You'd possibly want to compare versus non-auto-pilot Tesla drivers on the same roads in similar conditions, but the problem remains that the situations where auto-pilot is engaged may be different from those when the driver maintains control. In sum, it's hard to mitigate the potential confounding variables.