Oracle PCTUSED/PCTFREE settings

I'm a little confused in determining the optimal value for PCTUSED. I understand the principle, but well-known documentation (Oracle DBA manual, Oracle Design by O'Reilly) contradicts each other. I am inclined to set PCTUSED to zero, instead of leaving it at the default
of 40.
WHy does it matter how many deletes/updates i do? Is it okay to bring a block off of the free list when the block is empty?

--Michael

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