The car to be estimated is a 2015 Chevrolet Impala LTZ V6 3.6L with 136500 km mileage. The most relevant data point is a 2016 Impala LTZ with 180000 km sold for 57500 SAR in June 2024. This car is newer but has higher mileage, suggesting a slightly lower value for the 2015 model. A 2015 Impala LT with 182000 km sold for 45500 SAR in September 2024, indicating a higher value for the LTZ trim. A 2015 LTZ with 198500 km was listed for 56500 SAR, but not sold, suggesting a lower market value. Considering these, the estimated price for the 2015 LTZ with lower mileage is slightly below 57500 SAR.