AAA says that EV batteries tend to lose power faster in cold weather, getting as little as 50-60% of their advertised range.

Right, and the EVs that lose that much range are the ones with the smallest battery packs. The heating requirement as a percentage of the battery pack goes down as the battery gets larger. It takes roughly the same amount of energy to keep a 40kWh battery warm as it does to keep a 150kWh battery warm.

The same logic doesn’t directly translate for a car as a bus.