For modern highways, 70-75, I usually see about 25MPG. City is about right at 23. I do have a heavy foot, though.

I don't like letting my tank get low, so I tend to fill up when the gauge gets just under the 1/4 mark, usually around 350 miles.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!