I have W126 cars.

I can't vote because they have OM603's (are 300SDL's and 350SD).

But, I have gotten 30 + mpg in each of them. Typically average 28 - 30 mpg.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)