A few months after main drive battery fixed, suddenly one morning after charging all night, the green light on top of the dashboard showed constant green (full), yet the gage for expected milage showed only 62 miles mean expected. Since the new battery, I have been seeing expected miles of 240-250 average. I drove 44 miles to the our dealer. His men concluded there is software problems, and said GM knows of the problem and is working on a solution.
The dealer is providing a rental car. After 2 weeks, no solution found. Any once else experience this?