Yesterday going from NJ to NH. A Better Route Planner said I'd need to supercharge to make it.
The car, however, was happy with going straight through. Got to the town with the last supercharger with 20% left. The car was happy. At that point, almost all highway (70 mph) miles, it said the car averaged 313 wh/mi. My last part is on back roads and much slower (35 or 50 mph), so although my brain was screaming just add 10%, I pressed on. I had 26 miles to go. According to the rough calculations I did, I thought I could make it. The last 26 miles, the average was roughly 200 wh/mi even though there were some hills. I arrived with 14%. The car was correct and with the slower speeds the car performed great. I didn't find the graph until this morning, but sadly the picture I took of it has a flash splash and you can't see much of it.