The wagon should get a bit better than my TE -- 19 in town, 21-23 on the highway. The M104 is a more efficient engine (and smaller) so I'd guess 20 in town, 24-25 highway.

The wagon is hampered by a higher numberic rear end ratio, so burns more fuel.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!