I've been flushing one of my toilets with rain water for a month now. The results are in. The flow meter says that I've used 565.5 gallons of water.
flush the toilet. I also pressure washed some of the driveway and washed my cars. That doesn't really matter though. Using rain water means that I'm not using water from the water company. I'm interested to see how my bill will be affected. I just have to wait and see.