each manufacturer has a variety of different options or cycles, some use more water than others.....
as for energy start ratings, I have learned the more energy efficient, the less water it uses, or in fact, temps dubbed down really far.......those usually fell in a term they were using as 'Tiers', the higher the number, usually 1, 2, or 3....
my Frigidaire is a Tier 3, not having a clue at the time that it meant the energy savings was on water consumption, not that the machine operated using less energy itself...now I know better.....
I have adapted it to add more water on its own......but todays Flers are based on concentrated handwashing, in a lather of suds equal to washing your hands.....several rinses, although what may seem anemic by our standards, most machines complete this by saturation only and expelling water.....as much as we want badly to see splashing water, and hate to admit it, these machines do function rather well.....if you leave them alone to do their job.......
some things were just not going to get used to.....