To estimate the price of the 2014 Kia Sorento V6 3.5L LX (Base) with 256000 km mileage and in average condition, I considered several data points. The closest match is a 2015 Kia Sorento V6 3.3L LX (Base) with 261000 km, sold for 32000 SAR on 2024-01-07. Another relevant data point is a 2015 Kia Sorento V6 3.3L LX (Base) with 210000 km, sold for 33500 SAR on 2024-05-16. Additionally, a 2015 Kia Sorento V6 3.3L LX (Base) with 311000 km, sold for 33000 SAR on 2024-08-04. Considering the higher mileage and the fact that the car is a year older, I adjusted the price downwards. The listed price of a similar car is 30000 SAR, which aligns with the selling prices after adjustments.