To estimate the price of the 2021 Mazda 6 2.0L S Grade (Base) with 55389 km mileage, I first looked at the actual selling price of a similar car with 45500 km mileage sold for AED 58000 on 2023-08-25. This car is very similar in terms of variant and specs. Next, I considered the dealer-sold price of a 2021 Mazda 6 2.5L S with 77868 km mileage sold for AED 59491.5 on 2023-11-20. Although this car has a larger engine and higher mileage, it provides a useful reference point. I also reviewed the listed prices of similar cars, which ranged from AED 64995 to AED 72000, but these are generally higher than actual selling prices. Given the average condition of the target car and its mileage, I adjusted the estimate slightly lower than the selling price of the car with 45500 km mileage to account for the higher mileage and average condition.