To estimate the price of the 2015 Mazda CX-9 V6 3.7L High+ Premium (Top) with 145600 km mileage, I analyzed the listed prices of similar cars. The listed prices range from SAR 51000 to SAR 65000. The closest matches in terms of mileage and condition are: 1) 144000 km listed for SAR 60000, 2) 140000 km listed for SAR 61500, and 3) 139000 km listed for SAR 65000. Considering the average condition of the target car and its mileage, I adjusted the price slightly lower than the higher end of the range but above the lower end, as the car is in average condition and has slightly higher mileage than some of the listed cars.