Gargoyle reports less usage than ISP does

[rhodie]

ISP:

You are enrolled in the 10.00 GB Plan.
You have used 9474.66 MegaBytes (92.53%) this billing period.

Gargoyle:

74.347% of total up+down quota has been used (7.434/10.000 GBytes)

Is this typical?

[bossofsuccess]

Does your quota reset to 0 on the same date and time as your internet provider?

For example, my billing period ends on the 19th of the month at 11:59PM so to get the same numbers I see on the ISP website, I must set my quota to begin every month on the 20th at 12:00AM