It gets complicated, because you have to compare the amount of each food it takes to feed your dogs, as well as the price per pound to get a real comparison.
For instance, with approximately 320-330 pounds of dog (2 Filas + Bimmer) to feed, I buy a 28.3 pound bag of EVO every 3 weeks or so, supplemented by roughly 10 - 15 pounds of vegetables (sweet potatoes, Irish potatoes, etc) and 20 pounds of fresh meat and bones. Now, if I were feeding something like Purina, it would take at least a 40 pound bag per week to feed them . . .