For me Sarg did not give me the correct info. For all of November 2019:
- Comcast = 411 GB
- from the Comcast website
- IPFire = 413.36 GiB
- from IPFire WUI menu Status > Net-Traffic
- SARG = 110.44 G Bytes
- from the Squid Analysis Report Generator
Maybe SARG is only looking at non-SSL type data? (e.g., HTTP and not HTTPS). I am guessing!