Sums are pretty easy to do if one has the time.
These machines only have three fill levels; low (Normal Cottons/Permanent Press) medium (Delicates) and High (Woolens).
Wash cycles are at the given levels for particular cycle. Lowest for Cottons/Normal and highest for Woolens. Rinses all are high fill level unless "1/2" button is selected.
Manual tells that for starching the "1/2" button gives about five US gallons. But the Extra-Prewash (really a soak cycle with high water level) uses (according to tables) seven gallons.
Furthermore difference between using "Short" wash cycle versus "Normal" for cottons or Permanent Press (omitting Prewash) is about three gallons of water.
If we use the assumption all rinses use same high water level as Extra-Prewash (7 US gallons), and there are four deep rinses that fill after tub is drained (the first rinse in Normal/Cottons is a cool down that adds cold water to tub after main wash, and fills to "medium/Delicates level") 4x7 ='s 28. That leaves the difference of four US gallons to make the 32 used in Normal/Cottons. Thus between four to five gallons seems about right for the wash cycle in that cycle. Again depressing the "1/2 button" for rinses takes water level for those cycles down to five US gallons.
Manual notes water consumption numbers can vary and there is good reason for this. First and foremost these machines do not extract after main wash, first or second rinse. There is a short 30 second spin between Second and Third rinse, and finally a full spin between Third and Fourth.
This lack of extraction between rinses means laundry carries over amounts of water from previous cycle. Since textiles are already saturated they aren't going to absorb much more water. This is the same method used in many laundromat washing machines which cuts down on their water use as well.
Because of this carry over what a rinse cycle *could* fill to versus what it will is going to vary by many factors.
When these Miele washers finally do spin (short and then long as noted above), if there is too much water and or froth extracted at once machine will slow or stop spinning; but timer is not held. If that portion of spin cycle times out and there is still amounts of water/froth left in tub or wash, tant pis; the machine will begin to fill for next rinse with that "extra" water still in tub. So obviously that is going to influence how much water is taken on.
Depending upon where the timer is, the machine will fill to satisfy certain set water pressure levels. If said levels drop (as in textiles absorbing water) machine will stop and fill with more water until preset level is reached again. So if clothing is still "wet" it won't absorb as much water contrasted with either start dry or extracted.
Modern Miele washing machines use about 13.5 gallons for an entire cycle IIRC. This can be done because they extract after main wash and after each rinse. So they need fewer rinse cycles.
If you don't wish to run the sums the other painfully obvious answer to your query involves a bucket and measuring device. Simply allow washer to fill at whatever cycle you want measured, then set the machine to drain while the hose is in a bucket. Pour collected water into measuring device (or use scale) and that will supply answer.
