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I have just got a 2004 A6 1.9tdi multitronic sport, I came back from Derby in it last wednesday and it was reading 47.6mpg, now after a week of normal journeys, not really town driving but cold start and straight onto the dual carridgeway for 6 miles and then into town for 3 miles and back out again, it is now down to 38.2mpg.
When I picked it up it was only saying 34.2mpg.
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Your figures look about right - at the pumps (no DIS) I get around 39-40 mpg over a tankful on mixed driving. All motorway, more like 43; all town or heavy right foot, more like 36-37. All figures include use of climate control - gives about 5-10% hit on consumption.
(A6 1.9TDI Sport 6sp manual - supposed to be v. similar to Multi in fuel cons.)