VW Touareg Mk1 3.0 tdi

Just returned from the south of France with my 3.2 Shogun. Struggled to keep up with our friends who tow a similar van with an ML320 and I used a lot more diesel. Decided its time for a change and having owned VW's in the past fancy a MK1 Touareg. Any feedback would be appreciated especially with regard to fuel consumption both towing and solo