I think the maximum is about 6 kW in my Model S so if it were running flat out I think I would use about 25% more than if the climate control were switched off.

I think the maximum is about 6 kW in my Model S so if it were running flat out I think I would use about 25% more than if the climate control were switched off. My care typically uses between 180 and 220 Wh per kilometer, say 18 to 22 kW at 100 km/h.