We were lucky to find an off-lease E320S4 w/just 17K miles. Watch fuel capacity: it's 18.1 INCLUDING reserve. Owner's manual appears ambiguous re 2.4 g "reserve". A sporty ride, disguised as a family wagon.
The best thing about the Mercedes is the confidence that it will go anywhere you tell it to.
By now, the CD changer is in the dash; having it in the "way back" means negotiating with little hands to change CDs. This vehicle can handle a much larger fuel cell, and I'd buy one if it's available.