All cars suffer from poor economy until up to temp, the trouble with the MK7 is that it takes longer than ever to get to optimum running temp.12 mile journey used to be enough to have a decent proportion of the journey with the heating hot enough to see decent mpg and keep soot at bay with passive regens. Now I find it's more like 15/16 miles needed. I get active regens for about 20% of my driving. Sorry, but that isn't progress. The way the car is set up makes it increasingly less suitable for more users than ever before. I should not be having issues like that with average mileage (10/11k miles).
The effects of cold start will be lessened in the summer weather, as the ambient temp is 15 - 20C higher than it is now, and more humid air makes for a greater expansion under combustion as well as less dependence of lights and heating. Same could be said for any car. My dad is getting his first oil change next week, some say the car will run more efficiently after its first oil change. I guess we'll see soon enough.
