I bought the 1.6tdi SE Connect Estate; it was a bargain new and reports of the real-world mpg were much better than my previous car (40-43mpg). I persuaded myself that I was buying it with a 5 (to 9!) year plan too.
However, I think all of the mpg reports I read must've been on the flat with a trailing wind!
If I'd known that to attain around 57-59 mpg brim-to-brim over a whole tank would require such slow speeds I would have seriously looked at the 2.0tdi 140 or 170. When I drive mine "normally", at speed limits on my commute-route, the mpg is around 51-52. The 2 litre versions apparently can do similar mpg around the speed limit, and they do have a 6th gear...