A couple of points, I'm loving my is220d just a few strange bits.
I get 550-570 miles from a tank at the minute, however when I fill up the range only ever goes to 530, its nothing I loose sleep over I just wonder why it never shows what I will actually get. My trip computer constantly under reads by around 1.3mpg. The cars averaging 44.5mpg to a tank with a mix of motorway and town driving, just motorway sees about 46-48mpg to a tank. I still can't work 6th out, my car seems to pull it smoothly at 70mph however it doesn't use more or less fuel than using 5th at that speed so tend to just use 5th.
Also pondering in 18months when I'll get a newer one, are the 2009models really 5mpg better on average? I'll want the car to have cooled seats(I know these were dropped for the newest ones) and not to have DRL's, I think that'll mean a 2010 car will be the newest to have those two things??