I don’t dispute the figures, but I suggest he cherry picked his route so he could use the 250KWH superchargers and also avoid waiting in line. It also appears he picked an optimal time of the year to travel to avoid weather related loss of range. For those not familiar with EV charging, he didn’t fill up at each stop. He probably charged to something like 60% or so at each stop. Beyond 60% the charge rate starts to decline.
He tells how he picked his percentage range right in the video, and he didn’t cherry pick his route, he picked a route that would take him from where he lives (Idaho I think) to Jay Leno’s; the locations of charging stations are tracked by the car.