A6 Avant 2.8 Quattro Tiptronic...Talk to me

[Bisonhead]

As above, is there anyone out there with experience with this car and in particular this engine...what can I expect and is the fuel consumption as bad as I hear...low 20's?

Any issues with the gearbox or any other components of this complex sounding car?

Lastly, are there any straight forward mods that can be easily carried out?