Blood from a stone sounds about right dinnerstick , Last year I got 17 gallons from a small pickup bed full of apples using the garden way basket screw press. I suspect more time under pressure, sweating before pressing, and force would have produced a better yield. I had access to eating variety apples rough percentages are 60% granny smith, 5% Macintosh 5% crabs 30% a mixture of other eating varieties. The crab apples were an ornamental variety and really did not yield well because the grinder basically never touched them. I also bottled with a sumac (staghorn) infused priming solution. Overall the results were well received and the cider of 2009 is gone.