Why are the numbers that byobu reports for my network usage different from system monitor?
Notice that it's off by about a factor of 8...
Byobu, by default, is reporting "kbps", or kilobits per second, or 1000 bits per second. I chose that as the default reporting rate to match what other network device data rates are typically reported in (like 10mbps/100mbps/1Gbps ethernet, 11Mbps/54Mbps wireless).
Your network monitor is reporting KiB/s, which is kibibytes per second, or 1024 bytes per second.
You can trivially configure Byobu's network reporting unit by setting