I would think evacuating in a Leaf might be a bit scary, but any Tesla should be OK. If traffic is crawling along around 25 mph you might be able to hypermile a bit, though not if stop and go.
Back when hurricane Rita hit Houston there was a lot of fear and loathing because of what happened in New Orleans a few weeks earlier. I have a friend who was in Sugar Land and dutifully evacuated with everyone else. The traffic was so bogged down he figured they might get some flooding at their house, but they were inland far enough they should ride out the storm OK. He and his wife had a bad argument all the way home, but he pointed out their chances of dying in the traffic jam were much higher than at home.
Their neighborhood had a bunch of trees knocked down and a lot of fence damage, but they rode it out fine. Some people did die in the traffic jam, but I believe it was from a bus that caught on fire. Something for the ICE vehicles are dangerous thread...