I'm quite sure drag would play a part in performance. The wagons' rear isn't streamline-friendly, so it'll chew up more kw to cruise at say 100km
ie, an EB sedan might require 10kw of power to keep it cruising at 100kph (no winds), while the wagon variant might require 12kw due to its more abruptly-finishing ****-end. :p
-Dave-
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