One of the toilets is currently installed elsewhere, fed by a 1/2" branch off a 1" main, where it takes 50 seconds to recharge. So a real life 2.0 GPM, vs. a "book value" of 3.5 I think I'm supposed to use according to a pressure drop table I looked up.
Also, the bathrooms being serviced are on a 3rd floor of a house that's already off the street, so I'm assuming a 13 PSI pressure drop for 30 feet of lift. But we have excellent water pressure here -- I believe near 80 PSI at the service entrance.
So I'm not sure if I should be using 1.5 + 2.0 + 2.0 = 5.5 GPM for sink + 2 toilets which I think is real (and about 7.5 ft/sec flow rate), or 2.0 + 3.5 + 3.5 = 9 GPM which I think is the "book" value, because apparently that bumps me into the "undersized" region of the chart with a 12 ft/sec flow rate.