Hey guys! This thread was really helpful in giving me some backup charging options when going through this route. I have a Tesla Model 3 LR and charged at Winnemucca to 100%. I drove 65 mph and I eventually reached Boise with 3%. The Tesla trip navigator estimated that I would have 15% charge remaining. It's possible, but a little nerve wracking to run low. The discrepancy in remaining percentage was likely due to rain and wind on the last 30 min of the trip.
Just wanted to give you guys some feedback that it is possible. Total 253 miles in 4 hours at 60-65 mph