$8,500 is a fair price. According to Kelly Blue Book, the average private sale range is from $7,520 to $10,245 ($8,883 average). The lesser trade-in value is $5,945. With 125,000 miles, I would have a mechanic thoroughly inspect the car before I would tender an offer. https://www.kbb.com/dodge/charger/2010/r-t-sedan-4d/?condition=verygood&intent=trade-in-sell&mileage=125000&modalview=false&options=6349092|true&pricetype=private-party&vehicleid=261899