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If you want to beat the rated fuel economy you need to slow down, max 90km/h. Shift as early as possible, say 1600-1800 pms and stay out of boost. Modern diesels add fuel under boost these days to keep emissions down, unlike the old days where boost was free to some extent.
My DSG equipped VW 2L TDI is quite happy running around under 1600rpms, it does all the shifting and never has to see 2000rpm ever, and I can easily beat the posted FE on longer trips.
Let it die on hills, do not increase the throttle but keep a constant load and then lift up a bit on the down hills. Running a scangauge or read out on the dash is essential for this. Diesels of all types prefer a constant load, turbo or not. They hate hard use in terms of fuel economy, better then a gas engine but will never deliver good results when driven hard (the 80% rule doesn't work on turbo diesels, too much fueling).
Yes, this sort of driving is less then ideal on the VNT system (turbo vanes) over the long run, they need some exercise to stay free however the DPF will thank you, running light loads and not punching the throttle will keep it very clean, it is sharp throttle responses that load it up with soot. It will cycle itself as needed, no worry about it getting hot!
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