To estimate the price of the 2017 Audi A6 1.8L I4 35 TFSI (Base), I first considered the offers accepted by sellers. The closest match is a similar car with 71490 km mileage, which had an offer accepted at AED 70000 on 2024-03-08. Another similar car with a 3.0L V6 engine had an offer accepted at AED 65000, but this is a different engine variant. The 2.8L V6 variant had an offer accepted at AED 52000, but it has a higher mileage and is a different variant. For listed prices, a similar car with 71490 km was listed for AED 69000 and delisted in March 2024, indicating it might have sold around that price. Another similar car with 72137 km is currently listed for AED 54000, but it hasn't been delisted, suggesting it might be overpriced. Considering these data points, the accepted offer of AED 70000 is the most reliable indicator, but I adjusted slightly downwards due to the average condition of the car and the time elapsed since the offer was accepted.