Toilets (1.5 - 2.5 g per flush), then showers (2.5 g per minute), then clothes washer (about 15 - 20 g per load) are the big 3.

If you do 1 load of laundry per person per day (which is absurd), then the clothes washer cant' be even 1/4 of the over 80 gallons per person per day TFA claims.