I drove to Vegas as a 60D, came back as a 75D.
Way I drive + headwinds and who knows what, I was forced to tail behind a trailer and draft to make sure I make it to the next charger.
Now with the performance uncorking for 75D, it makes it even more worthwhile to up the battery.
As a general advice, everyone should stop at Barstow and Primm. You never know if the highway gets congested and it becomes harder to get to the interior LV chargers.