The car to be estimated is a 2016 Mazda 6 I4 2.5L S (Base) with 347,000 km mileage in average condition. The most relevant data point is a 2016 Mazda 6 I4 2.5L S (Base) with 222,000 km sold for 28,000 SAR on 2024-06-30. Given the higher mileage of the target car, its value should be lower. A 2016 Mazda 6 I4 2.5L Core (Base+) with 204,000 km sold for 37,000 SAR on 2024-04-03, and another with 175,000 km sold for 37,500 SAR on 2024-05-10, indicating that higher mileage significantly reduces value. Considering the target car's mileage and condition, a reasonable estimate is lower than 28,000 SAR.