Yes, I mentioned in another thread that my machine now, when the Warm Rinse button is pushed, it gives a warm spray rinse, along with the deep fill warm rinse.
Alright, for the record and that I want to confirm my suspicions with certainty.
The warm spray might might explain it all. Have you timed the fill from empty to extra large on hot, warm and cold? I am curious how much water is being invested into the spray rinse.
I've found that for any given load about half the water used for a deep rinse will almost always make a satisfactory spray rinse. For example, if a single deep rinse takes 18 gallons of water, a spray rinse of 9 gallons will get the job done comparably to an 18 gallon deep rinse.
The math also works out really well for delicate and casual garments. Say that it takes 4 minutes to fill an 18 gallon tub to full for a deep rinse on warm. If we do two 60 second warm spray rinses that equals 9 gallons, exactly half the water of a deep rinse for a cotton/denim load. Now, if we switch to cold for delicate and PP items, it typically takes 6 minutes for the tub to fill to full on cold for a deep rinse. Those two same 60 second spray rinses now give 6 gallons of water or 1/3 the water of a deep rinse. Considering that delicate fabrics are thinner and hold less residual carry-over, the 6 gallon total sprays are typically satisfactory.