You have approximately 17 pounds of grain there. I would expect you to lose approximately 2 gallons to grain absorbtion. The other gallon you could be losing to mash tun design... Seems a little high, but not necessarily out of the realm of possibilities. Now you shouldn't lose anything during the sparge because the grain would be fully hydrated. EDIT: Also, I'm making assumptions here because you appear to be confusing the terms "mash" and "sparge." I.e., you state: "60 min sparge at 154..."
I love the sound of an airlock bubbling in the morning. It sounds like.....VICTORY.
Originally Posted by TxBrew
It's now degenerating into nu uh and uh huhs and it no longer serves a point.