I get ~35 on hwy trips. 3L turbodiesel, 4sp manual, 380SEL rear end (forget the ratio, though...). Oh, and huge friggin' tires from a newer E-class (looks pimp, kills milage ) My speedo is off ~23% because of the differential, and reads 50 mph when I'm doing 65, if anyone has the gearing specs for various cars sitting around and wants to do some math.