We just bought a 1999 E320 wagon, the first tank was 22mpg, all city, lead foot, with the AC on. I am pretty happy with this milage.

The 1983 300TD 285,000 miles gets 24mpg city average and I got 30 on a 600 mile trip last winter averaging 65mph on the highway.

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1982 240D - just drug home
1999 E320 Wagon 155,000 - Sold
1983 300TD Gold 285,000 - great car miss her
2004 VW Jetta Wagon TDI - our first diesel love, missed
1955 CJ5 with a 350 chevy