Yah. It depends on the cold Don. On our last winter trip to Vancouver the pre-conditioning kicked in at least an hour before. (Minus 27). Pulled into the supercharger hooked up and it pinned at 254 kw. (18 percent ish). Horrible weather. Got our coffee and giblets and back on the road. Long trip, slow roads although some of the truckers didn’t seem to think so.US 50 would be more than an hour away from any superchargers, IIRC. But Hwy 50 has MANY CCS chargers. Perhaps your car works differently or because it's colder there. I normally see the "battery reconditioning" message when I get a few minutes away from a Supercharger, but I have only used it a couple of times.
-Don- Reno, NV