I have a 2009 e320 bluetech (no adblue), <35K miles.
I would love to see 32+ MPG, bit alas, my car typically averages 26 (up from the ~25 when acquired with ~24K miles. I have gotten over 32 MPG the day I purchased in DC area and brought home, but only by putting it in cruise, running at 70 for a good few minutes to reset any brain monitoring it.
Certainly, my relatively low mileage -- in large part -- is related to my driving style, yet I'm not complaining anyway, given the thrust these 642 engines have off-line.
There's lots of reports here about oil leaks; however, either they fixed that problem by the latter end of the 2009 model production when mine was produced, or I've gotten extremely lucky: in 13K miles, I have only had to crack one bottle of Mobil 1 ESP, and pour off maybe four or 5 oz.
The car is comfortable, has a nice sound system, a somewhat acceptable Nav, and a good quality 'telephony' system (both ends).
Really, even though it's an old man's car, I enjoy it, except for the suspension, which has a slight end-to-end bounding feel (what one might envision from a freaking GM product), which can be coupled with a side-to-side whipsawing feel at speed, in high-winds.
Worse than bounding/whipsawing though is the skittering over some (many) bumps. I've had it to the local dealer, and they say nothing found, but they drove it less than a mile (and in either direction there's a school zone with an overall 35 MPH limit), and probably didn't even pull the covers (it's going into a local shop for a pull-apart and documentation to make my case before going back to the dealer while my CPO warranty is valid).
cs