The auto trans was failing, and I suspected slippage. Moving off a stop would produce major groaning if I leaned into it. Hence the swap.

What is interesting is that I was getting a consistent 24 mpg with that auto, which led me to believe that it wasn't slipping that much on the highway, since that did not seem particularly low mileage.

I know some folks have claimed upwards of 30mpg. I never believed them. Maybe I'll change my opinion.

I'll post some results my next fill-up. Thanks for the replies

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Peter
1985 300TD 4-speed 212K
1992 400E 343K
2001 E320 72K