After 12,000 miles no problems whatsoever apart from the mechanic's greasy footmarks all over the front carpets after the 10,000 mile service.
I do not drive slowly but still have averaged 48mph on mixed road driving, around 50% motorway and the remainder A and B roads. It's as economical as my previous TDi Golf mk3.
48mph - that's quite economical. Do you mean 48mpg?