I put in some injector cleaner and changed the air filter. Drove around town for a few days. Then back on the road. 500 miles with the same problem: higher temp, lower mpg.

Then it switched back to normal, running temp and mpg increased by about 3. I noticed no other change in environment or in the car. It just "fixed" itself on its own.

I doubt it was the injector cleaner or the air filter, though I can't rule them out. Anyone have an idea?

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1984 300D Turbo 350K 50K WVO (two tank) "Maeby"