Tom,
Yes, your water amounts seem the same as what I measure. The purge volume seems to vary. When I first measured it, the sump had dried a bit, perhaps because I had drained it slightly when adjusting the hinges yesterday. I got six quarts for the purge that time, which is 1-1/2 gallons. Then I ran a full cycle, and then checked the purge volume again. This time it was more like 9-1/2 quarts, which would be close to 2-1/3 gallons, same as for the other fills. So the total water consumption is about 9-1/3 gallons. Modern dishwashers can use as little as 5 or 6 gallons, but I understand that figure can soar due to dirt detectors that will increase the number of rinses as they think is needed. Still, 50% more hot water isn't such a big price to pay for a 22 minute wash!