My best was on a relatively flat day of steady driving on a highway trip in my 1979 300sd: 30.5 mpg (but those were Imperial gallons).

I don't think I ever got within 4 mpg of that again.

My current '85 300d seems to give me just a hair under 27 most of the time, in a mix of urban and secondary-highway use.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22