Volvo XC 60 D3 AWD as a towing vehicle??

Who already has experience with the new (BJ. 2011/2012) Volvo XC 60, D3 (163 hp machine) AWD as a towing vehicle for a residential car (1600 kg)?? Is the machine sufficient for occasional WW vacations running over the Alps or Pyrenees or would the D5 (215 hp) machine be significantly better suited? In everyday operation both distance and city traffic (in total approx. 20,000 km) are driven, so I want to keep in mind the diesel costs. 1 1/2 l / 100 km more, I think particularly thoroughly about which equipment/machine is the optimal for me. The WW is moved 2- 3 times a year, no more. But of course I do not want to “hungry” already on the Sauerland line or the “Kasseler Bergen” with it! Thanks for competent answers.