I have the same car, same year, mileage is very close to what you have posted save for one, that 33MPG, must be some downhill. In flate land, on inter-state speed of about 70mph, i get 28mpg. what i can't figure out is that is this car has a 18 gallon tank or 21 gallon? i get two different figures from different sources. Anyway, my old( sold) 1995 BMW 525it wagon gets one mpg better than this E320 wagon at highway speeds, but in city driving the BMW gets one mpg less than the Benz, these two cars weight almost the same. the difference is in the 2.5l inline 6 to the 3.2l V6.