Interesting. I filled up the car earlier in the week and calculated just over 73mpg, 50/50 mix of town/minor roads and A/B roads, no motorway driving. TDI special edition, MZN box. I do a lot of miles, usually fill up a couple of times a week and have seen between 71mpg and 79mpg lately.
Keeping on topic, today I am going to put the new cambelt on the wife's car and hopefully put in the new engine mount (older style engine side, will require modification as it's from a Polo or Lupo, will let you know how it goes)