PLUS EV,
I used to drive Vegas to Seattle every year on an ICE car. I take 93 from Vegas to Twin Falls then turn west on I-84. I am not confident that my MY can do that part of the trip. From Twin Falls to Seattle should be no problem. Any suggestions? Thanks.
I've done this one quite a few times in both an ICE and a Tesla. Used to live in Vegas and still have some business interests there.
The route you mention is the one that is always recommended by Google as the fastest path (except using the 318 cutoff through Lund of course), but there isn't much in the way of reliable EV charging along this route, and you would still have to detour to the West Wendover supercharger instead of going through Wells unless you want to spend even longer on a slower charger, so that makes it about 45 minutes slower.
Only an hour slower than that is to just stay on the interstate and go up through SLC. The huge benefit here is that there are superchargers all along the way. You'll never have to slow charge and you'll never have to charge to anywhere near 100%. This ends up saving you at least as much time as taking the route through Ely would have and has the added benefit of not leaving you dependent upon 1 or 2 Chademo stations in Alamo or Ely. Also, you don't need to buy the Chademo adapter if you haven't already.
So until they build a supercharger in Ely (or maybe also Wells), I recommend staying on I-15 unless you are looking for an adventure or don't mind overnighting some place that has an L2 charger.
There are also other options such as going through Reno/Susanville/Klamath Falls. This might be more scenic, but it is a little slower and I wouldn't attempt it in winter. If the weather looks real bad, you might want to just drive over to Bakersfield and then up I-5 to Seattle from there. This route is 2-3 hours slower, but rarely suffers from winter weather.