Check the seals around the tailgate and the spoiler area. Tightening the spoiler bolts might help, but also look for worn or misaligned seals.

What other dealers say about this?

The "dumb" charger test should help figure that out.

It could be down to driving habits or how the system calculates the range. Sometimes, the range doesn't update right away after topping up.

The range estimate isn't super precise to begin with, and it can change based on driving style, weather, and even the fuel's blend. Adding a few quid after a full tank is normal, it's just topping off the vapor space. But the 20-mile drop in the displayed range is odd. Maybe check your tyre pressure...

Sounds like a glitch in the system, either the app or the car's charging system itself. Bypassing the app is a good troubleshooting step.

I want to get a new car but it's from another country and I'm worried about shipping. Who has gone through such an experience, what can you say?