219 Wh in his last 30 miles and 245 Wh in his last 250 miles.
So even at 245 Wh/mile (4.08 miles per kWh) you'd need 73.5 kWh vs 72.6 usable, he'd have to slow down just a hair to make the full 300 miles at that consumption but he sure doesn't have to let it roll down the side of a mountain. He already said he was doing highway speeds on that trip.
I'd also argue that he means ~300 miles, and is really seeing more like 29x miles on that charge and simply rounding up to 300 for simplicity sake.
Most people don't charge to 100% daily so if you want to take daily range for people that don't charge to 100% his ~300 miles won't happen.
But for him apparently it's a somewhat normal day to charge to 100% and drive several hours. I'm glad my day isn't like that.