I am not sure about the new Maytags, but on my Kitchenaid which is now Kin to Maytag the 1 hr wash is slightly different.
On the normal wash, which is where the energy star testing is conducted, the machine does an initial fill then senses the load, then fills a little more then washes a few seconds and senses again, then fills again until the optimum water level is reached for that load. Then it begins the program of washing, sensing, washing changing water etc. This process takes about 90 minutes or more depending on the options chosen.
On the 1 hr the machine immediately fills to the maximum level and washes for the designated time, does a water change again to max fill, until the cycle is completed. I timed it 59 minutes exactly. I think this may explain why it uses more water and energy, because it just dumps and sprays instead of sensing and measuring.
As for the washing ability, I didn't notice anything different other than the dishes did not seem to be as warm when the cycle ended, Of course all options are disabled except the heated dry on the 1 hr so sanitize and heated wash were locked out. . [this post was last edited: 9/6/2013-11:02]