EPA has released official fuel economy ratings and just saw a billboard on 405, showing the trunk of a black 328d and saying "
45 mpg, yes, you read that right".
RWD: 32 City / 45 Highway
AWD: 31 City / 43 Highway
For official info/specs on the 328d, see
here.
Here's the link to the EPA info:
http://www.fueleconomy.gov/feg/Find....n=sbs&id=34050