Just took a 550 mile road trip in my now 6 year old Bolt (Central NY to southern VA).
Reminder for all - the Bolt is now 10-year old technology and was the first practical long-range EV you could buy. A lot has changed in 10 years and I look forward to getting some of those improvements (more efficient cabin heat, battery pre-conditioning, faster DCFC charging) when I buy my next EV in 4-5 years. For the few big road trips I do in the winter, this is very manageable and the Bolt has few drawbacks during warmer months or the other 90% of my driving miles. No regrets.
I left at 7am (sun coming up - nice to get some greenhouse warming with the sun in the winter) and it was -4 degrees F when I left. Ugh. I had charged the car up to 90% during the sunny afternoon the day before, and then set it to top off to 100% 2 hours before leaving (this is a trick to get the Bolt to start to condition the battery to warm up, in case it didn't automatically start the cycle to do that). When it is -4 degrees, I don't have any concerns with charging to 100%, especially if it is quickly discharged during a long road trip.
First charging stop 120 miles later was a long one (about 3.2 miles/kWh , so used almost 40 kWh, the battery was really cold, I was running a little heat and had an overall climb) - 1 hour and 20 minutes to get to 75% at about 22 kWh/h peak charging rate (ugh - cold battery). I've learned that the Bolt needs a good DCFC cycle to warm up the battery for the next DCFC cycle and that's what it was doing here. Next stop 120 miles later was a lot faster (29 kWh/h initially, then up to 43 kWh/h peak) and the weather was warmer (about 30 degrees F). This is the brutal fact of the Bolt on winter road trips - it takes time. Luckily, it is just me so no complaining passengers.
As soon as I could shut the heat down I did, and my efficiency was as good as 4.1 miles/kWh from Northern Virginia to Richmond (about 38 degrees F, some traffic limited average speed to 55-60 mph) - not bad for the winter with snow tires. From Richmond to the coast was about 3.4 miles/kWh going 65 mph. I can honestly say that speed kills efficiency with snow tires on. Probably about 0.5 miles/kWh of the efficiency loss during the last leg of the trip is due to the car going 5 mph faster on the highway. Posted speed was 70 mph - if I drove that speed I probably would have dropped below 3 miles/kWh (with snow tires).
4 stops total, probably about 4 hours total for charging, and some of that is time I would have spent stopped otherwise for bathroom, food, coffee or rest breaks. Some of the stops were at Electrify America chargers at Wal Marts, so I accomplished a little shopping while waiting - I live in a rural area and traveling distances for shopping is necessary, so getting this done while traveling is a bonus and I have the time while charging anyways.
Every time I make this trip I am amazed at the number of new DCFCs that have opened up. There is now a big new Ionna DCFC in Scranton, PA and another new big DCFC opening soon near Harrisburg, PA airport. 6 years ago I-81 was a charging desert and now it is pretty well served.