My total guesses for cruising at a steady 75mph on a reasonably flat run:
335i (manual) 40 - 42 mpg
335i (auto) 43 - 45 mpg
335d 48 - 50 mpg
330xd 52 - 54 mpg
330sd 57 - 59 mpg.
There are too many variables for us to prove conclusively what the exact figure is for each car but it will be interesting to read people's findings.
