Tesla's Autopilot miles are highway miles, but Tesla is comparing those miles to fatalities across all types of roads--freeways, highways, normal streets, dirt roads, etc. On the safest type of road (i.e., freeways, which have the fewest obstacles or impediments to driving), Tesla is no better than the national average over all types of roads.

And that's horrific. It means that Tesla isn't saving lives, it's causing more people to die than would have died if they hadn't been using Autopilot. Worse, as Tesla's many competitors have demonstrated, is that self-driving cars can be safer than human-drven cars. Just not the way Tesla does it.