The only way I can make this happen is the combination of driving in freezing temperatures, with the heat blasting the whole time, while doing ~80mph.
Also using heat instead of seat warmers just hurts you for the same level of comfort.
I keep it at 65 and let the heater do whatever it wants to do so that people are comfortable. Temperature, elevation differences, and wind definitely change things.
There's a section of the drive where I average something like 1.3 mi/kWh on the way up the mountain, but something like 6 mi/kWh on the way down. On the return trip, it's kind of fun to see the guess-o-meter show 110 miles remaining over the course of 25 miles, or have it actually increase.
I'm sure that gas vehicles follow a similar pattern, but I don't pay attention to usage like I do in an EV.
You're not actually going to get 200mi from 100% when you have 2 people and baggage loaded and traffic exists, and no one sane would be comfortable arriving with literally 0% battery. Charging stops take minimum 10 minutes just accounting for getting off & back on the freeway; usually more like 30-40 minutes because why would you not just charge back up to 80% since you're stopped anyway? Your destination hotel almost certainly does not have a charger, or if they do they charge an idle fee, so you can't just leave it overnight, so really that has to count as another charging stop.
Realistically you're talking probably two 30 minute charge stops in each direction. That's not completely unacceptable (eg just have some lunch at one of the stops) but your 5-8 minute quote is absolutely not realistic.