One more thing I would add. The 2-3 gal left in the mash keggle includes some of the converted sugars. You should compensate for that by bumping up your grain bill. Maybe by as much as 25% for a 5 gal batch
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Looking back at his post a little more closely, it doesn't appear that he is unable to drain the last 2 or 3 gallons of fluid but rather that he needs to add 2 or 3 gallons before it gets above the false bottom. So, assuming he adds the extra strike water, I'm not sure what effect it would have on his efficiency.
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