In winter I don't see a much better option. If it were summer, you could probably go Powell to Sheridan to Wheatland to Denver, but that Sheridan to Wheatland stretch is 255 miles so that is pretty tough in winter unless you want to arrange some type of L2 charging in Casper.Longtime Tesla Fan, stock owner, Model 3 deposit holder-switched to P100D owner. I live in Powell. It will be interesting making the trip to Denver to the nearest Tesla service center. It wants me to drive to the Gillette Supercharger and then down to the Wheatland Supercharger for the yearly service. That only about 3 hours out of my way. HA! There has to be a better option.
By the way, detouring to Gillette only looks like it adds 1.5 hours, not 3. Detouring to Sheridan adds an hour anyway so it isn't much better.
The only other option would be overnighting in Casper in each direction, but that adds even more time and you still have a 236 mile leg to contend with from Powell to Casper so you'd have to drive slow and be careful. Probably best not to chance that type of drive in winter if you are a new owner.
EDIT: Just noticed another route and I think it is your best option. Powell to the Rawlins supercharger is a 283 mile leg which is too long to attempt in one shot in winter. But there is a high amperage L2 charger at the Breadboard in Riverton that will get you about 60 Rated Miles of range in an hour. If for some reason it is occupied, there are a couple slower L2 backup options in Riverton (see Plugshare).
This route through Rawlins is barely shorter than the route through Casper and Cheyenne. And once you get to Rawlins you are on the "Supercharger Highway" as there are plenty of superchargers between there and Denver. You'll want to drive slowly on the Powell to Rawlins leg as this will help reduce the amount of time you need to stop and L2 charge in Riverton. Something like 10mph under the speed limit is probably optimal.
Lastly you may want to thank TMC forum member @pox for the Breadboard L2 charger!
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