Jumping it to further clarify-
We determine "Water Saved" by adding up any runs that are skipped due to Weather Intelligence features (ie Rain Skip, Freeze Skip, Climate Skip). Since flex scheduling doesn't necessarily skip (I would call it more of a push), this feature is not available on Flex schedules.
I think ultimately the best comparison is comparing "pre-Rachio" water usage to "post-Rachio". I love seeing YOY water bills for this exact reason. However, it would be difficult to capture your pre Rachio watering habits. Any thoughts/ideas?