> An EV gets better mileage in a traffic jam than it does at highway speeds, so it's a true 150 no matter road conditions.

You don't live in snow country. While winter reduces ICE vehicles' range as well (this isn't meant as a slam against EV's), you may lose 40% of your EV's range just due to cold weather. A multi-day power outage could easily drain what remains.

Also, ice storms cause a lot of power outages. This isn't a hypothetical for large parts of the country; power outages are more frequent in the winter.

Personally, my response is a variation on "do nothing". I have propane around for cooking and heating water, and I have a clean-burning kerosene heater to help keep the house warm-ish if we can't run the furnace for an extended period of time.