The economy does improve after you have had a high speed run. Blows the accumulated sh-t out of the engine, i.e. gets everything 'cleaned' up by doing a long drive where all the deposits that have built-up from short runs gets the combustion treatment (i.e. burnt).
When on longer runs, I tend to keep the revs in the most efficient range (1,800-2,000+ rpm) with a load on the engine for extended periods of time, which is where optimum combustion (and economy) occurs, with revs below 1,800 rpm you would typically be generating more soot (i.e. which will be caught in the dpf and will decrease the interval for regens to occur) - that is why it is advised that you take the TDI (and all cars in general!) for a 1-2 hour high speed run on a regular basis.
Myself, have done just over 17,000 km in 6 months (mostly long trips with about 20-30% mixed city driving). The economy has been speed dependent - if I am cruising at a constant 90 km/h (or less) then I am getting below 5l/100km . . . on the other hand, if I am cruising at 110 km/hr (or a little above ) then the economy goes to around the 5.5-6.5l/100 km mark. This is all with air-con running as well as not being gentle on the accelerator when overtaking or needing to do a twisty (i.e. fun) section of a road (the car is normally loaded with gear - equal to 2-3 passengers). Admittedly, most of the driving would be with the adaptive cruise on. In smooth flowing city traffic (with the odd red light), I have managed to consistently get between 4-6 l/100km - with heavy traffic this would increase to between 6-8.5 l/100km (rarely going higher unless it is some serious stop-start gridlock involved!).
Re tank range - I am getting about 800-900 km from a tank (from filled to the brim until I get the empty light) in mixed city driving and easily 1,000-1,100+ km when cruising interstate. My economy was pretty good from the start (did not baby the engine, other than basic precautions as per manual). In the first couple of weeks of getting the car: my first run was about 7.0 l/100 km (900 km run, this was a couple of days after I got the car, it had just 200 km on the clock - full car), the second run (return leg of first run) got 6.5 l/100km, third run was about 6.0 l/100 km (another 1,000 km, with load) and the return leg of that was giving me under 6l/100km. Since then the economy has been consistent - would improve if I cruised at a lower speed, but I like to travel at the (license preserving) speed limit . . .
MY12.5 B7 Passat Wagon : : TDI Highline : : Icelandic Grey : : black leather interior
sports pack | sat-nav | panoramic glass roof | adaptive cruise control | driver/lane assist | bi-xenons/LEDs | RVC plus | auto-park | auto tailgate | tow-bar | mud-flaps | sill-protection | wood trim - ||| - Lakin plate mounts | tinted | Opti-Coat | LED reverse lights | bright white driving lights + turn lights (LEDs were too 'dim')
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