A drop from 80% to 20% in a 300mi car is 0.6 * 300 = 180 miles. It's a 350 mile trip. 350 / 180 = 2 80-to-20 discharges, and that's assuming no little detours for stopping at a cheese store or whatever. So we could do it in 2 stops if we were OK arriving with 20%, but we need some charge at the destination for getting around MKE, so it's three stops. And yeah, we drive 75 because that's the speed of traffic and the HVAC does whatever it does to make us comfortable.

Why are you leaving home with 80% charge and why are you limiting discharges to 20%?

Also using heat instead of seat warmers just hurts you for the same level of comfort.

There are 30-50 mile (>10%) stretches with no fast chargers in WI. I'm not going to risk being stranded if one is broken and I need to make it to the next one.

I occasionally drive 300 miles in an EV rated for ~319 miles, and I have to stop once in each direction, but I also have to charge at my destination. There's a Tesla station near there, and the rates are fantastic if you get there before 7 AM.

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.