| Greetings fellow Canadian!
I have a 320 CDI as well, coming up 1 1/2 years. Love it, love it, love it. It's my first MB and I cannot be happier with it.
As far as fuel consumption, the best I've achieved is 7.7 L/100km on a leisurely highway drive (about 100 km/hr on cruise control) a couple of months ago. Typical day-to-day consumption is about 10.5, mostly on suburban roads. If I'm on the highway in normal traffic with higher speeds (still some local driving in there), I'll get 9.5.
I rarely let the tank go to empty...I think the most I've put in is about 79 L. | 
