Brew Dudes: What is Mash Efficiency?

After getting a new mill John has been wondering how to quantify what more the mill will deliver on top of just milling grain. We discuss what mash efficiency is and John postulates that depending on efficiency he might be brewing cheaper batches if he can achieve better efficiency than he got when ordering grain precrushed online. See more information here: http://www.brew-dudes.com/mash-effici...