Perhaps they are giving the same ratings because, actually, the efficiency difference is not that significant? Or do you think they are handicapping the ratings

Perhaps they are giving the same ratings because, actually, the efficiency difference is not that significant? Or do you think they are handicapping the ratings in some way? I keep it that I can find no difference between operating in with one or two hoses myself https://news.ycombinator.com/item?id=24025482 https://news.ycombinator.com/item?id=24025482 .