I too find myself topping up on occasion. At one time i had to add a quart at just over 1,000 miles after my previous topup. According to the Macan Good to Know App it states .8 L / 1,000 Km oil consumption is considered normal. If I did my math right that’s .845 Qts / .62 Miles or 1 Qt / 735 Miles. Maybe in the 60s and 70s that would be acceptable but in 2018?