I have been juicing oranges for decades, but I usually juice them a few at a time, and had never actually done a whole bag. Still, I got an 8 lb from Safeway not too long ago, and figured I’d juice all of it and see what I got. The answer: 4 cups of orange juice, a quart.
Navel oranges are selling at Safeway now for $6/7 for the 8 lb bag.