I'm very confused at the mindset behind these "water-efficient" machines. From the specs of these new Whirlpools, the dishwasher will use about 3-4 gallons of water on a Normal cycle. However, if you read the fine print, that only happens with lightly soiled, basically prewashed, dishes. With a load of dishes much like I would load, covered in dried on sauces, oatmeal, and the stray pea or noodle and crumb of meat and the like, these machines can easily use 5-7 gallons, or sometimes more, making water changes 6+ times throughout the cycle.
Now, take the PowerClean design. The earlier models from '98 to around '02 would run a Prewash-Main Wash-Purge-Final Heated Rinse on the Normal cycle. At around 2.2 gallons per fill, that's about 6.8-7 gallons of water. Normal wash on these machines can easily wipe out what a new machine has to use Heavy or Pots & Pans for, which equates to the same amount of water. The later update to the PowerClean removed the prewash from the Normal cycle, as well as implementing a purge instead of a full prerinse on the Heavy cycle. At this point, Normal used about 4.5 gallons for a full cycle, and could still handle heavily soiled dishes.
It would seem to me that if Whirlpool would revisit the strengths of the PC design, and update the motor and electronics to be more efficient and be smarter with water and time management, they would once again have a dishwasher that trumps the competition. One of its strong points, much like the Hobart KitchenAids, is that the water usage per fill is higher, but it does fewer water changes. If this dishwasher can run one wash and one rinse, with a purge in between, and get perfect results every time, why did we ever switch to using a thimbleful of water per charge, with water changes every five seconds?
To me the logic behind more water per fill is that the soil coming off the dishes is much more diluted, and there is enough water to create a hurricane inside that flushes every surface clean. Once the wash is done and drained, and the small amount of water used in the purge clears the filter module, the same amount of water used for the wash is now used for the rinse, again, diluting any remaining detergent and soil to the point that it's nearly nonexistant, and the dishes get flushed squeaky clean. No kibble left in annoying places, no pesky film or residue left behind from the chemicals needed to compensate for the tiny amount of water in new machines, and a dishwasher that also keeps itself spotless even in the behind-the-scenes areas.
Whirlpool had a good thing going at that time, and it seems that they were in that mindset with the Point Voyager design; it wasn't as solid and powerful as the PC, but it was still a great dishwasher. Then these "eco" designs came along and it's like they threw everything they had been improving upon for the last 30+ years straight out the window.