Just FYI, but seems like I recall that free flow air filters will make a difference ONLY at full throttle ... maybe it was Pat Goss? So, if you drive at full throttle only occasionally, it likely is, again, on the margin (admittedly, we drive at full throttle more often in diesel cars than in gas power cars).

__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg