To estimate the price of the 2020 Porsche Cayenne Turbo V8 4.0L Twin Turbo with 65000 km mileage, I first looked at the selling prices of similar cars. The closest match in terms of engine and variant is the 2020 Porsche Cayenne V6 3.0L, which sold for 255000 SAR and 220000 SAR. However, these are lower trims (S variant) and have higher mileage (77000 km). The Turbo variant is a higher trim and should command a higher price. The listed prices for similar Turbo variants are 419500 SAR and 500000 SAR, but these are likely higher than the actual selling prices. Considering the higher trim and the listed prices, I adjusted the estimate upwards from the V6 selling prices. Factoring in the higher trim and the mileage, I estimated the market price accordingly.