Covered over 1k miles now. Long term economy is 45.2mpg (according to the DIS) which is the same as the Golf manages long term.
Gave it a wash earlier and fitted some Whispbars. Whispbar now make them in black so I don't need to wrap them like I did on the Golf.
As the flush rails mean the bars...
Both my Golf and A6 regen with less than half a tank, so strange if this is the case for your car.
The DPF shouldn't require the level of attention you're giving it. It doesn't sound like it's actually caused any problems, so relax a bit and just enjoy it.
I need to upgrade VCDS as I've only got the MicroCAN which doesn't work with the A6.
It's a known software problem though - there are 3 options missing from the MMI and the mirrors is just 1 of them so I'll wait for the update either way for that.
7 days and 500 miles later, absolutely loving it. Comfortable, drives lovely, the gearbox is superb and the MMI is easy to use. MPG is steadily improving. Never feels like I'm going as fast as I am - even in Efficiency I've found myself going 80+ without realising. I expected the car to be...
From other posts on here and VWAF I don't think 16 weeks is typical - I suspect it arrived on time and they just wanted it registered in September not August but I wasn't in a rush and their service was excellent didn't really question it.