Help! Total loss on my 2009 G8 GT, only had 53k miles, had almost every option available, 8k in performance work done, perfect condition inside and out looked brand new. Bought the car from my son, loved it and couldn't stand to see it leave the family! Two weeks later kid pulled out 3' in front of me and I t-boned him, totaled the G8. Insurance is offering me $12,500, I paid 20k.. Can anyone give me advice on where to find out what previous cars for sale actually sold for or any other details I can use to challenge the value? Insurance adjuster obviously does not consider what replacement cost would be based on the available cars I see listed.I don't know how they arrive at a value ... I'm a 63 year old widow and have never had to deal with anything like this before, so any advice on what to do would be greatly appreciated!