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They used 8 items to represent a hand-washed 2 people meal - 2 plates, 2 knives, 2 forks, etc
Most people would run it more full. Just like some people wouldn't use 30L water a day to wash their stuff in the sink. Basically their arguments are bullshit for people who are used to not wasting water. Maybe I'm just odd because I grew up in a drought-stricken country (although living next to a river made that seem at odds with my reality).
I don't understand this bit. Who runs a dishwasher with 8 things in it? You wait until it is actually full and have done a certain amount of Tetris style shuffling before running it.