Yes, instead of using a wild-ass-guess, why not fill in the estimate using actual data from the flow meter (calculated rate in GPM after the calibration) times the zone run time saved by the Rachio.
If I had this number, I might be able to take the numbers to my municipal water & sewer department and argue that they are over-billing me for sewer because I use water for lawn irrigation.
I can’t possibly take a set of wild-ass-guess numbers which exceed my total water usage as evidence.