1990 300E. 153K miles.
23 mpg mixed 20%city/80% highway.
25-26 all highway.
Cold weather (below 20 deg. F) knocks it down about 10%. Air cond. doesn't hurt it quite as much unless it's a lot of in town driving.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".