Hi,
Yes, it is possible to reduce it.
Here are some tips for you to experiment with.
First rule : reduce the amount of data you're printing.
Are all the fields you're showing really necessary?
Can some of the alpha fields be truncated, let's say
from 50 to 20 characters?
Can you display zeros as blank?
If a certain field repeats N times, can you set a break
level and put it as a header? Or, can you just display
its first occurrence?
Second rule : experiment with different printer drivers
This is specially true on Windows, where they can make
a BIG difference.
I had a 2x PDF increase just by going from HP Laserjet
4L to HP Laserjet 5 drivers. Experiment also with
PCL and PS drivers, you can have some surprises there.
Check also that you're using the lowest possible
resolution (that satisfies to your users), a 1200x1200
DPI Address Book PDF will be larger than a 300x300 DPI,
and both may look almost equally nice.
Regards,