I get from 25 (around town) to 30 (conservative highway) MPG using dino-diesel in mine.

It should not be slugish at all.

I have about the same miles showing (171K now).

It could be a number of things (turbo not functioning, waste gate stuck open, fuel supply, injectors clogged, timing chain).

__________________
current Benz
'87 300TD (white) 168K (on the odometer as of 15 April 2004)
past Benz owned & miles I put on them
'62 190D 20K (white)
'63 190D 20K (beige)
'65 190D 35K (white)
'73 220D 175K (metalic green)
'79 300D 135K (metalic blue)

driving a Benz diesel since'77