This is EXACTLY what I am looking for with the Rachio and the entire reason I joined this forum. I was really hoping this feature was already implemented but it sounds like it's on the roadmap so I guess I can wait.
What I would love to see from it:
A- General estimation for zones
B- Customizable water consumption for each zone, let alone each type. Ex, I also have a severe case of OCD and I have measured with my current system how much flows through by checking the water meter for each zone. Just saying that there are multiple drip zones doesn't always mean they will use the same amount of water per minute.
C- Adding a water rate. My water rates are $6.141 for the first 3x CCFs, then they jump to $7.153 for each CCF after that. Different months offer different rates. If it doesn't get that complicated that's ok, A single water rate to be entered would be fine as I'm sure my house will use around 3 CCFs for month for toilets / showers / sinks / etc.
Summarizing the above into a chart / graph that can state how many minutes each zone ran, at what rate, that would put an easy immediate perspective of water used, water saved, $$ saved. Etc.