Since the gauge does not work, I am a bit anal about filling up, resetting the trip odo and calculating the mileage.
With cruise control set at 75 on the interstate I've gotten 27 mpg. Typically with a mix of interstate and local driving its around 23.
If I'm sledding around enjoying the 5 speed its more like 18.

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95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k