How much to feed? Breastmilk & Supplementing

Elizabeth

My baby girl is 8 weeks and 8 pounds (born 5 weeks early) and seems to always be hungry but all the weight based guides (75ml x 8 lbs = 600) imply I’m way over feeding her (she gets at least 750 ml per day, 60-70% pumped breastmilk, 30-40% formula but would eat 900 if I would let her). Are these weight based guides based on formula (which is perhaps more filling?). How much does your baby weigh, how old and how much do you feed? Thank you!!