Some of us do 1000 miles in a long weekend to the German A8 Treffen and the D2 is the perfect car for the trip. Heading home on the Sunday we visit 5 countries in one day
Last year we went for a week and covered about 2000 miles with Mike's S8 set up for the Nordschleife (access denied) with coilovers set to schnell! and AP racing brakes, and even that was fine. We had the cruise set to 130mph on the autobahn at one point - no drama.
I've done Exeter to Edinburgh in a day in my S8 which was much, much nicer than flying. I did a round trip to Leeds the other day in Big Red too (600 miles, 8 hours of seat time), although I will admit that by the time I got home I really hated the gearbox ratios in the 2.8 as they are far too high. Its constantly changing between 4th and 5th on the motorway so in traffic I just leave it in S (max of 4th), only using D when the road is clear.