Our 300E has gotten anywhere from 11.5mpg to 22.5 depending on how well it was running for that particular tank.  
My 300SD (which I love more every day after dealing with a gasser) gets anywhere from 18 to 24 in the winter (depends how much idling/reving to get out of snowbanks....) and a solid 23-26 in the summer.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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