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I do a mixture of highway/stop start traffic (my average speed is something like 30km/h according to the trip computer). With my previous car which was an X1 s20d I was averaging 12km/litre (roughly comparable to the 320d though the F30 has a slightly new tune and 8 speed gearbox). The 328i has been mired in the high 9s. If you do mainly country then the difference could be less.
To be honest the 2 engines are completely different beasts. I think you may need to test drive both to see which one you like best, apart from fuel consumption.
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