yo,

i just put in a K&N air filter on my 1991 300D 2.5 turbo. when i did i really didnt think i would see a difference, but was i wrong.
i had a huge improvment in highway milage (@80 mph):

28 mpg (before)
33.4 mpg (after)

nothing else on the car has changed, but i am thinking that the old air filter may have been overdue for changing, but it didnt seem that dirty. the car isnt any faster, but i definately wasnt expecting that!

was wondering if anyone else has put one of these in their diesel and what kind of results they got.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350