> A good diesel estate might average 50mpg if driven carefully, but in towns a lot less.
Going to fuelly.com, newer Golf TDIs seem to average out at 40 mpg, with the tails trailing out by +/- 5mpg:
* http://www.fuelly.com/car/volkswagen/golf?engineconfig_id=10...
The older 1.9L engines are slightly better.