I got home last night with my MY2012 Volt with 4 miles range left on the guess-o-meter. I left it parked in the driveway as my wife was charging her Volt at the time. Within 15 minutes of getting home we were off with friends to a church function. About 2 1/2 hours later we got back home, my wife's volt was finished charging so we moved hers out of the way. I then got in mine to move it up the driveway so I could charge it. I was really surprised that the 4 miles of range I had when I parked it about 3 hours earlier was now gone, and it immediately showed me being on fossil fuel. Since it was raining, I knew it was not due to cold temps. What could cause the 4 miles to disappear in a matter of 3 hours and not running?