I get a steady 23-24 on biodiesel, in a mix of city and highway driving.

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Charlie

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'66 VW 1300 96K miles
'97 E300D 239K miles
'85 300D 203K miles (sold Sep 2012)

My 85 300TD gets 22MPG very consistantly. The ALDA has been bumped to smoke, then backed off until very little smoke on WOT. I never drive for maximum mileage. The best I've ever gotten was about 26MPG mostly
highway, on a trip to the bay area, about 260 miles round trip. Again I wasn't trying for mileage. I drive in a "spirited" manner, most of the time.
90% of my driving is in town with 20-30 miles highway thrown in every
couple weeks. When I use my Jaguar in the same manner, it gets about
12MPG, so needless to say, I am happy with the TD

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson

I've averaged 22-23 so far over the 8 times I've filled up my tank. And, a lot of my miles are city and nearly all with a mpg lowering roof rack.

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1984 300D, 228k, Light Ivory, Java MB-Tex

20 MPG for me - 80% city - 90% leadfoot.

There's a larger dataset on another website that has the "Official Fuel Economy report thread" and most report in the low to mid 20's. Some higher, some lower. I get 23 on 50/50 city-highway in an '83 300CD

http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1230119-official-fuel-economy-report-thread.html