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Your sort of mpg is not good, but you already know that, 34 mpg is what I used to get out of re-mapped 335d..........I would certainly expect to get significantly more out of a 320d.
I know a bloke who has an '07 plate 520d coming up for 70k miles (he's a rep) and the car is going in for a second set of new injectors following his second bout of poor fuel economy.
I am no engineer but have heard it muted that in order to obtain such official and 'claimed' fuel economy figures in the first place, part of that process may be to run the pressure within the injectors quite high, which may sacrifice longevity of said injectors. I don't honestly know.
From what you've said your wife Helen appears to drive longish distances which should be producing decent mpg returns, especially in an oil burner.
I'm currently getting 19 mpg if that makes you feel any better..............just trying to make you feel better.....hopefully!
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