I owned a '92 300D 2.5 for a few years (wish I had kept it) and in town I got 24-26 mpg depending on my right foot. On the highway I would get 30-35. I once drove from El Paso to San Antonio, 540 miles at 90 mph and squeezed 30 mpg. Pretty good I think for 90 mph. That car handled like a dream at Autobahn speeds.

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San Antonio, TX.
1983 300D