ciscoios, that seems right in line with our experience. We averaged 14.5 US MPG hand-calculated.
Here's a reliability update on our Touareg after 65,000 miles. We had one low DEF warning that would not clear after refilling the DEF tank. Had to take it to the dealer who cleared it and it never happened again. Also had a glow plug warning light that I understand can mean a weak ground on the low-pressure fuel pump in the tank. That cleared after I shut it off and started back up. Never came back, so don't really know what that was.
For a super complex vehicle with gobs of power and refinement, I think this is pretty awesome reliability. Some truck guys seem to have a personal vendetta against them (and SUV's in general), but we love it so don't care what they think.
Someone commented on the WDH hitch issue using an Equalizer. You should try a standard (cheap) WDH like the Eaz-lift with 600 lb bars. I noticed a huge difference in leveling, steering, and braking with the proper tension applied.
We no longer have a TT to tow, but remember the experience wistfully sometimes as we are rolling in the F350 DRW with the truck camper down choppy pavement.