I just overhauled my cyd. head on my '84 300SD doing everthing.
Overhauled the injectors and got a rebuilt tubo. My car starts and run's great, has a lot more power ...but I am getting only 20-22 MPG. A few months before the work I was getting 25-27 MPG...and then it started getting worse until it was smoking bad and getting 19-20 MPG on a good day, with little power. I did a leak-down test and knew my tubo was sick, so I did the repairs and it runs so good now I almost hate to do anything else, but I should be getting better mileage. I am thinking the timing might need to be checked/changed or my tubo is not working correctly. Anybody get any ideas why I'm not getting better mileage?

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1983 300SD 343K everyday car
1983 300SD 285K from junk yard-tooks parts from deer car- runs great. Brothers car.
1984 300SD parts car-Hit deer
1979 300D 175K non-turbo "Doctor"
1979 300d parts car