To estimate the price of the 2023 GMC Sierra Denali V8 6.2L Denali (Top++), I first looked at the new car prices for different variants of the 2024 GMC Sierra. The closest variant to the Denali trim is the 5.3L V8 AT4 Crew Cab (AWD) priced at AED 271,000. Given that the Denali trim is typically more expensive, I estimate the new price of the Denali to be around AED 300,000. Since the car is a 2023 model, it has depreciated for one year. Assuming a 10% annual depreciation, the estimated depreciation amount is AED 30,000. Therefore, the estimated market price for the used 2023 GMC Sierra Denali V8 6.2L Denali is AED 270,000.