I brewed my first batch on Thursday with grain milled in my new Mighty Mill 3. I had the gap set at 0.035. I don't measure my efficiency (lazy), just gauge how good my crush is by what my preboil gravity winds up at. For BIAB I'm usually using 12-14lbs of grain (this one was 14), and strike with 10g of water. After the mash is done and I squeeze the bag, I wind up with just about 9g of wort. Grain bill was 8lbs pilsner, 4lbs two-row, and 2lbs wheat malt, mashed at 152°. Preboil came out to 1.041, a bit better than my usual 1.030-035. What really impressed me was the lack of a stuck recirculation; since I don't insulate my BK/MT, I have to apply a small amount of heat when the temperature starts to drop. Then I run the pump very slowly from the bottom and into the top to distribute the heat evenly. With the previous mill's crush (very fine) sometimes it would get stuck. Not this guy! Ran fine the entire 30 minutes. I'm going to brew again tomorrow, this time will condition the grain and tighten the gap down to 0.030 or thereabouts, and see what happens. Also going to use the mash tun instead of BIAB.