I watched this yesterday… we all know range is better at lower speeds, but I really appreciated this level of detail and some insight into the difference we might see in practice.
I watched this less than 12 hours before we drove our Macan 4 more than 900 miles in a single day (today!). Going faster to save overall time (compared to slower driving) does work, but the first DC charge of the day was the only charge to hit 300+ kWs. This real world issue messes with the analysis.
We charged the car to 100% on AC power about an hour before we left and then drove it to 20% SoC. Our first DC charge at an EA 350 kW had a nice 21 minute 20% to 80% charge curve. But we never saw that an any of the other 5 EA DC charger stops that we also made today.
Having said that, except in 2 areas where the charging options were limited, we just drove the car as fast as we wanted to because we needed the driving breaks on the 900+ mile trip. 150 kW or better DC fast chargers were readily available today on the I95 corridor.
It's nice to know how much further we can stretch the battery by slowing down, but it's one of those "in case of emergency only" things for me. Driving below the speed limit on interstates in the US just goes against my grain. I've done it a couple of times in my Mach-E where range was tight making it to the next charger (drafting behind a semi with ACC set to 1), but it's not fun watching the rest of the traffic blowing by me like I'm someone's great grandma. We didn't buy a $95k car to compromise.