To estimate the price of the 2015 Mercedes GL500 V8 4.7L Twin Turbo with 248100 km mileage in average condition, I considered the following data points: 1. A similar car with 204000 km sold for SAR 66300 on 2024-09-02. 2. Another similar car with 96000 km sold for SAR 135000 on 2023-12-07. 3. Listed prices of similar cars range from SAR 63000 to SAR 145000, with closer mileage cars (around 200000 km) listed between SAR 72000 and SAR 77000. Given the higher mileage of the target car, I adjusted the price downwards from the selling and listing prices of cars with lower mileage.