Just wanted to share my recent experience with Bannister GM Vernon. I was questioning the current battery capacity of my 8 year old car, and so turned to the GM dealership. The technicians there were very thorough.
They performed a diagnostic check and found no issues. Then they went the extra mile and drove the car to verify the range and kept the car overnight to establish capacity loss with time, which was miminal in this case. Thank you for checking into this for me.