If you car is sitting outside overnight, then you will see quite high Wh/mi numbers on the first drive of the day as energy is used to warm up the pack. You can reduce this by preheating the car, but that doesn't necessary reduce your total energy consumption, but makes your Wh/mi number look better as the trip display Wh/mi number only considers energy use while the car is driven, not parasitic energy consumption for such things as preconditioning. If you have the ability to charge at home, the most efficient way to preheat the battery is charging and timing your charing to end shortly before your scheduled departure.
For context, here's 5.5 years, 65k miles of real world data off of my MS90D. I think I'm base a little farther south than you, in south central Indiana, so not as cold on average but has winter trips through the NE included. While my lifetime average is right around 278 Wh/mi, you'll see some individual trip dots as high as 500 Wh/mi and other warm weather driving as low as the 240s. I don't tend to drive quite as fast as you, probably more like 73-75 on interstate, so that also influences some difference. You can clearly see the seasonal variation due to largely ambient temperature.
View attachment 732818