Problem with bandwidth

[Michael_google gmail_Gersten]

I'm trying to find out what I'm doing wrong with bandwidth settings.

In my torrc:
BandwidthBurst 30000
BandwidthRate 22000
MaxAdvertisedBandwidth 20480

However, Vidalia reports that my bandwidth is 27KB/s, ignoring the
MaxAdvertisedBandwidth.

I'm seeing total outgoing traffic (system wide) of about 28-29KB/s
when the system is idle but full of Tor. My normal upload limit is
around 35KB/s.