My wife and I live at the top of a big hill which on the way up, our "projected range" drops rapidly. The "rated range" however stays pretty constant. If I'm on a long trip over the mountains and my projected drops to say "0" but my rated says "75km" will the car stop? Should I be concerned? Do I really have 75km left? Or, let's say we are driving home on the hwy and the projected says "50 km" and then on the way up the hill it drops to "0km" but the rated still says 50km? Just trying to figure out which one actually indicates "your out of power!"