I have had my Volt for almost 2 weeks now and am a little confused by what the EV value means. When I first got the car, when fully charged it said EV Range 48. After driving and charging it went up to EV Range 49. It seems to be higher each time and tonight, after charging it is showing EV Range 58. Since the literature states an EV Range of 53, I am trying to know what to expect this reading to mean.