I just bought a 1992 300d that seems to be running good. The gas gauge is a little wonky below half way so It is hard to determine whats left in the tank. What kind of mileage should I expect from a tankful.

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I routinely get 30MPG (combined HWY and City) (Last fill up was 30.5MPG) I usually fill up around 450 miles or so 15 gallons.

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92 300D 2.5L OM602 OBK #59

30 is pretty good number for me too....and I have two of them. I could maybe see 31-32 on a nice highway trip. Around town, in winter it can drop to as low as 24. I've some some who get higher....must be my driving habists.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife