I have a buddy with a Jetta diesel, when I mentioned I had ordered a TCH he he made a joke that his VW gave better mileage. I aked him had he ever really checked he said "no but that's what VW rated it at and besides it was a lot better than his Pontiac Montana". He checked his mileage over the next week and was surprised that it was not as efficient as he thought. His remark "Geez what is the Montana doing!"
I took delivery of mine Wednesday evening it was filled by the dealership and I'm assuming to the top of the tank. I drove 618 kilometres between then and now (Friday evening). I filled it on the way home because tomorrow I am doing a 550 kilometre trip. It took 39 litres which according to this site
works out to 6.31 litres per 100 kilometres or 44.78 miles per imperial gallon or if my math is correct 37.5 miles per US gallon.

Obviously I am still getting used to the car, it is still new and tight and we do not know just how full the car was. So far I am happy as I believe both the car and I will improve.
Apart from anything else I'm just happy to be back in Toyota country.