A new waterline for a new residence pressure varies from 45-60 psi average is 53 psi highest fixture is 20` above main meter. What pressure would be used to determine pipe size from the water pipe sizing table in chapter 10 of the UPC?

A new waterline for a new residence pressure varies from 45-60 psi average is 53 psi highest fixture is 20` above main meter. What pressure would be used to determine pipe size from the water pipe sizing table in chapter 10 of the UPC?