Assuming a M103 engine....

Maybe as low as 18 in town, rising to 25 on the hiway.

Early cars feel a bit more nimble, 90+ have a nicer interior and the updated outside trim.

93+ have the M104 engine with more hp and the same mpg.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles