Have both a 2015 Macan S Cobb tuned and 2018 Audi SQ5. The Audi has an 8 speed transmission versus the Porsche 7speed. Our Audi general runs around 19mpg in town versus 17 on the Macan if you (baby) it. Your Macan should be getting at least 15 mpg driven at 80 to 85 mph if cruising. If your hamming the throttle flooring it to overtake cars I don’t think 11 mpg is not out of the question. We have poor fuel in Phoenix and high highway speeds driven aggressively fuel consumption can be bad in the Porsche.