One site I found says hand-washing takes 15-50 gals of water and a dishwasher uses 16 gallons for a full load. This was on wholywater.com.
I own a dishwasher and only run it once every other day when its full. Before the dishwasher, I was using two sinks of wash water and rinsing under the tap, which I turned on and off as needed. My water consumption dropped around 500 gallons a month after the dishwasher was installed.
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