Well not quite slowest, but it is an EPA rated range, which I think means it is for 65 mph, but don't quote me on that. However, even at 80 mph, your graph shows it to be at 220 miles.
The worst case I've heard of range loss in sub-freezing weather with the heater blasting is 40% reduction from EPA rating. That would put it at 170 miles at 65 mph and 130 miles at 80 mph. It is just something that you have to be aware of, and with recent software updates, the car does a good job nowadays of giving you a good range estimate when you turn on the car.
I’d like to see the amp draw on them when they go up steep hills.
I’d like to see the amp draw on them when they go up steep hills.