1983 300SD - 400K+ miles. Original injectors and needs a valve adjustment!:

Recent highway run, pretty smooth 70mph or so: 25mpg

Earlier test: mixed highway/stop and go in town driving, A/C running all the time. Bad compressor, so high load: 16 mpg.

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'83 300 SD
'05 E320 4Matic
'06 BMW 530 xi
'68 Triumph TR 250 - The only car I ever loved more than the Mercedes; who needs electricity, anyway? - Damn, why did I sell it?!
'59 Jaguar 3.4 'Le Chat Noir' - Damn, why did I sell it?!

It's difficult to make predictions, especially about the future.
- Niels Bohr