I brewed a 1.067 Porter AG and got 81% efficiency. Right after, brewed a 1.076 IPA and got 70%.
I bought the grain and had it milled at the same time at my LHBS. Both batches hit ~152* in the mash. Both were stirred well several times during mash and sparge. I had 2 friends there that were brewing too, and they agreed that both batches were brewed basically the same.
I'm wondering why such a large difference in efficiency? Can the quality of the grain affect this?
I bought the grain and had it milled at the same time at my LHBS. Both batches hit ~152* in the mash. Both were stirred well several times during mash and sparge. I had 2 friends there that were brewing too, and they agreed that both batches were brewed basically the same.
I'm wondering why such a large difference in efficiency? Can the quality of the grain affect this?