I've got a C350CDI and its the same, but that is because its a Merc. The BMW and Audi 3.0 diesels are much better on fuel. The Merc 3.0 diesel is pretty tragic for fuel economy. My Dad's 530d is more powerful, heavier and about 5mpg better on average than my C-class.
That said I have got a real 48mpg out of mine, but that involved a single 200 mile journey on the M6 at a steady 65-70mph. The moment you accelerate or use the power, the fuel consumption plummets, it almost as if its pouring fuel in by the bucket instead of precisely measured injection cycles.
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