I know the 998 wasn't considered in this thread, and thats probably because of the testastretta engine, but hopefully it is ok that I post here. My 2002 has 39,xxx and is running strong. I ride it almost every day and it never disappoints.
Just bought a very nice 748 with 49000 miles showing. Runs really sweetly. Previous owner had it for 16 years, and obviously treated it well.
After my December 2020 post and returning from my French road trip last week, a small update. Reached 80000 km's [50000 mls] whilst riding through some of the most famous vinyards around Bordeaux two weeks ago. Mileage was at 81183 on landing back in Blighty. Watching those digits click round felt like 'achievement'. Engine/gearbox still not been apart.