Thanks for the suggestions. I made the trip north today and the mileage was horrible. Left Lake Anna with ~250 miles (it was in energy mode showing 89%) and had 160 miles at Haymarket. I am typically rushed when making the northern trip and today very much so. I only stopped in Haymarket long enough to add 20 miles to make it 180. The problem with charging at that point is I still have over half a tank left and charging is slowing down, it was about 76 kW. I didn't check the numbers on the chargers to make sure I wasn't on the same pair as someone else, but I'm pretty sure I've checked before and they are in sequency, 1A, 1B, 2A, 2B. I charged next to the handicap spot so I should have been on the pair to that one. 76 kW seems slow for being at 55%.
I made several short trips around Frederick and only have 40 miles left! I don't think I was impacted by the cold so much as it isn't so cold and other than when starting the day, the car never showed limited regen. So with about 170 miles of driving I managed to use about 80 kWh.... hmmm... let's try some math, that would be 470 kWh/mile. That seems genuinely crappy, especially considering the roads are mostly 55 and I would have driven around 62. The heater was set to 69 and I used one bar on my seat heater.
They have permits and site plans for a Supercharger in Frederick. So by summer when the Haymarket charger will do the job a lot better there should be a place in Frederick to charge. I will be doubly covered.