Anyone else noticed how the nav system on the i4 gets wildly optimistic when you hit the Grimsel in winter? I did the Zug-Bernese Oberland run last weekend, and the estimated range dropped like a stone once the elevation kicked in. In practice, I had to stop at the Guttannen charger twice as often as the car predicted. Not a dealbreaker, but worth planning for if you're heading up there soon.