I recently purchased a 25k 2013 C-Max . I'm trying to understand the basics of using the EV. I guess the first question is why does my battery after my all day charge or my all night charge (I charge at home and then I charge at work, my commute is about 33 miles each way)... why do I sometimes get 21miles max, 23miles and this morning it showed 28miles available in EV mode. I would think that the capacity is computer controlled to prevent overcharging? Is 28miles charged going to cause a problem? Is it common for the gas cap to be very delayed in opening (last time I pressed it 3 times, and after 10 seconds I started looking in the owners manual to see what I was doing wrong)... at 15 seconds it popped open and I felt foolish. How common is it to get the Audio Off bug? It happened to me. Btw I've put 2000 miles on the car since I bought it, I love the car, and my current mpg is 69.5.