tor man page should clarify that KBytes is 1024 bytes
We say K as if everybody knows its 2^10^. But it has confused peripheral apps, like apparently nyx looks at "15 GBytes" in a torrc file, and helpfully visualizes 15 billion bytes for the user, when actually Tor means 15 << 30 (a bit over 16 billion bytes) the whole time.
This distinction doesn't matter much in the kbyte range, but in the gbyte range it can add up. And for folks who are trying to do bandwidth accounting properly, it could be a nasty surprise -- especially if their ISP counts gigabytes as billions of bytes.