Your lucky, my 05 3.0d wont go below 12l/100. Combined city/motorway driving, maybe 40-50km per day.
6-8months ago, it used to do about 7.8-9l/100 with the same type of driving. All figures from the onboard computer.
I know it has an issue, cleaned out the EGR, Intake Manifold and replaced MAF. Still searching for the problem.
Also, last fill up, I got my diesel (Caltex) for AU$1.32 and normal unleaded was AU$1.39..
Rob