I feed my Dogs Pedigree AND?

I use Blue Buffalo for my puppy and I have noticed she doesn't eat nearly as much as my previous dogs did when given Purina Dog Chow. It actually fills her up and keeps her full versus her eating and eating and eating and not staying full. I pay about $60 dollars for a 30lb bag and it's worth it. She is about 3 months old and almost 30 lbs and I still haven't used even half a bag in over 2 weeks now.