I've been finally reunited with my 83 W123. Driving 80-85 in the high desert of nm. I've been clocking 28-29 mpg. Car has well over 300K and runs strong. Is this pretty normal? Does anyone get much better mileage than this? I'm pretty happy with it.
My tach is broken about what rpm's is it turning at 85mph?

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Nothing in this world can take the place of persistence. Talent will not; nothing is more common than unsuccessful people with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan "press on" has solved and always will solve the problems of the human race.
Calvin Coolidge (1872 - 1933)