When the REX kicks in that should be your sign that you need to get to a charging station. The REX motor was not installed so you can continue to drive your car for another 60 miles. I'm reading all over this forum is how people are trying to get the REX turned on sooner, or using it to...
The vehicle can not performed preconditioning without being plugged into a wall charger. Also if you are to precondition the interior the battery will also be preconditioned.