Surprised by the same message on a 2,800-mile trip. We had a 'feel' for what we needed to reach our next charge (I never charge all the way, the top end of charge is slow, besides hard on the battery), and a message popped up "stay below 75 to reach your destination. A bit later it said "below 70..." - once again, "below 65..." so we opted for a closer charger. Evidently a headwind.
The surprise was how the car is always evaluating its environment and state of charge - and alerts you how to achieve your destination.
Best car I've ever owned in 64 years.