re: winter range, my understanding is that EVs with heat pumps (including Teslas) tend to have much more efficient heaters than ones without heat pumps (e.g. Bolts).
re: speed and consumption, for sure. But because the Bolt's DC fast charging rate maxes out at a fairly lame 50-55 kW, and speeding => reduced range => more charging time required, so on a long Bolt road trip there's diminishing returns from speeding a ton. I suppose it depends a lot on terrain and climate though, since e.g. speeding can be more beneficial if it means you're running the heater for less time.
re: speed and consumption, for sure. But because the Bolt's DC fast charging rate maxes out at a fairly lame 50-55 kW, and speeding => reduced range => more charging time required, so on a long Bolt road trip there's diminishing returns from speeding a ton. I suppose it depends a lot on terrain and climate though, since e.g. speeding can be more beneficial if it means you're running the heater for less time.