To estimate the price of the 2015 Mazda 6 I4 2.5L Ignite (Top) with 276000 km mileage in average condition, I considered several data points. First, I looked at the selling prices of similar cars. The closest match is the 2014 Mazda 6 I4 2.5L Signature (Top+) with 286000 km, sold for 35000 SAR and 33000 SAR in December 2023. Given the similar mileage and condition, these prices are highly relevant. The 2016 Mazda 6 I4 2.5L Core (Base+) with 222000 km sold for 28000 SAR in June 2024, which is a lower trim and has less mileage. The 2017 Mazda 6 I4 2.5L R (Mid) with 90000 km sold for 31000 SAR in October 2023, but it has significantly lower mileage. Considering the higher trim level of the Ignite variant and the higher mileage, I adjusted the price slightly lower than the 2014 Signature (Top+) models. The listed price of a similar 2015 Mazda 6 I4 2.5L Ignite (Top) with the same mileage is 32000 SAR, which aligns with the selling prices of similar cars.