Yeah, yeah...
As for the twin turbo - I'm sure you mean bi-turbo - idea there is litle that can be done about the traction issue whilst remaining front wheel drive... four-motion? But I doubt it will happen... VW have been able to build a EEC VI compliant diesel with > 180bhp... would it be possible with a bi-turbo diesel with an output of ~ 230bhp... if not I doubt that they'll do it.
Back to economy... just clicked over 4K miles on the last fill (based on data in Road Trip app):
From new: 4191 miles
Overall Average: 46.10
Worst between fills: 40.63
Best between fills: 50.24
Vast improvement over the last month (last 2000 miles) from an average of 43 in the first 2000 miles - last five fills worst... 48.58.
No obvious change in driving style that I'm aware of, perhaps average journey slightly longer...