To estimate the price of the 2015 BMW 640 M Sport 3.0L I6 TwinTurbo with 91200 km mileage, I considered the following data points: 1. A 2016 BMW 640 M Sport with 152000 km sold for AED 67500 on 2023-08-18. Adjusting for the lower mileage and one year older model, the price should be higher. 2. A 2015 BMW 640 I6 3.0L Twin Turbo with 91085 km was listed for AED 48500 but delisted on 2024-09-12, indicating a likely lower selling price. 3. Other 2015 models with higher mileage (116920 km and 122000 km) were listed for AED 76000 and AED 69000 respectively, but these prices are likely higher than actual selling prices. 4. Considering the average condition and the closest comparable car sold, I adjusted the price downwards from the listed prices to reflect a realistic market value.