To estimate the price of the 2018 BMW 730 Li I4 2.0L Twin Power Turbo with 101000 km mileage in average condition, I first looked at the actual selling prices of similar cars. One car with 92000 km sold for 138000 SAR on 2024-02-27, and another with the same mileage and condition sold for 132000 SAR on 2024-08-12. These are the most reliable data points. Next, I considered the listed prices of similar cars, which ranged from 130000 SAR to 148000 SAR, but these are generally higher than actual selling prices. Given the car's average condition and the most recent selling price of a similar car, I adjusted the estimate slightly lower than the highest selling price but close to the most recent sale.