SorinOfInnistrad

I just got my 2017 Fusion Energi and I am curious on a few things. 1. When the EV battery is depleted, if I am going downhill, will it charge the EV battery back up and give EV only miles again? 2. I am planning on a 500ish mile road trip. I am curious if I am able to set the car to drive as if the EV battery is just a very large Hybrid battery? I am going to be driving at 80mph and wouldn't get much use of the EV only mode.