One thing to remember is this if for production style feeding and raising of meat birds. Not free range or a more traditional style chicken feeding/raising.
I don't have much experience but mine have seemed to line up pretty good with the age and body weight when fed all they can eat for the first 2 weeks then 12 on 12 off from there. I don't recall if I ever tracked the cumulative feed consumption to how much mine were consuming. I would pay more attention to the weekly cumulative number and not so much the daily number. See how long it takes to go through a 50lb bag of feed, divide that by the number of chickens and see where you land on the age.