I know I'm not vintage (I browse all the forums) but my SE gets about 20, and the 400 gets 22-23. You really get almost 17? Thats not bad for a 117 motor, especially a 4.5er!

Mike

PS, do you have a picture of your car? I love two tone.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E