Yeah, that's about 7.4 gallons an hour.. Sure seems high.
But, the fedgov seems to think it's average..
Per capita water use. Water questions and answers; USGS Water Science School
"Estimates vary, but each person uses about
80-100 gallons of water per day.
Are you surprised that the
largest use of household water is to flush the toilet, and after that, to take showers and baths?"