Just curious what’s their reasoning?

Our is factory fitted and it shouldn’t matter much in aerodynamic and range wise. Battery consumption would be more related to acceleraion and driving habit. in the city I get 11.7 - 12.5 kWh/100km so yes should be doable for Syd Can trip on an extended range. If you have luggage I would recommend an after market roof tray to make it easier loading unloading. Just finished its first 1000km so no idea how things will be.

Definitely need bigger boot space I find the front is quite a lot of waste space but decided it’s better than hauling my aged hatchback WRX around with petrol price these days. I learn to live with it but roof rack is a must.