"27 gallons sounds mighty suspicious to me, i would discount this test as propaganda."
I wouldn't discount it, you'd be amazed how much water people use rinsing dishes.
"I believe that people with dishwashers rinse their dirty dishes as well, before plopping the dish to wait in the dishwasher."
I don't rinse my dishes before putting them in, I scrape the bulk of it off into the trash and put it in the dishwasher. So you aren't at a tie, you are likely using more since you rinse your dishes after you use them.
My dish washer uses under 6 gallons of water on its highest water usage cycle, including the water I use to initially get the hot water up to the dishwasher. 2kwh for washing, heating the water, and drying the dishes with the highest energy cycle. New energy star dishwashers use even less.
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