To estimate the price of the 2015 Chevrolet Impala V6 3.6L LTZ (Top) with 90000 km mileage, I considered several data points. First, I looked at the selling prices of similar cars. The 2016 Impala LTZ with 180000 km sold for 57500 SAR on 2024-06-01. Given that the target car has lower mileage and is a year older, it should be valued slightly lower. The 2014 Impala LTZ with 232000 km sold for 23500 SAR on 2024-01-28, but this car has significantly higher mileage and is older. The listed prices also provide insight: a 2015 Impala LTZ with 90000 km is listed for 56000 SAR, and a 2015 Impala LTZ with 198500 km is listed for 56500 SAR. Considering the lower mileage and the average condition of the target car, I adjusted the price slightly lower than the listed prices but higher than the older, higher-mileage sold cars.