A lot!!
My brochures don't go further back than the early eighties, but that are the pretty much the same machines. A Miele dishwasher from 1981 would use 51 litres or 13.5 gallons for a normal cycle. I think a normal cycle had a prerinse, wash, rinse and last rinse. Temperature of the main wash and of the last rinse 65*C or 150*F
My brochures don't go further back than the early eighties, but that are the pretty much the same machines. A Miele dishwasher from 1981 would use 51 litres or 13.5 gallons for a normal cycle. I think a normal cycle had a prerinse, wash, rinse and last rinse. Temperature of the main wash and of the last rinse 65*C or 150*F