You might want to check a few more tankfuls to get a good average. The best I have ever achieved was slightly over 40 mpg with a 190D 2.2 5-speed car, which "should" get better mileage than a 123 model wagon with a 3.0 Turbodiesel and automatic tranny.

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner