I brewed a batch of this beer this Sunday. I was shooting for a half recipe (5.75 gallons). I halved the amounts of all the grains from the original recipe for 11.5 gallons. BeerTools Pro calculated I should have gotten an OG of 1.040 at 75% efficiency. To my surprise, I ended up with 5.4 gallons of 1.050 wort post-boil. I can attribute some of the higher than expected gravity to a slightly low post-boil volume, but I must have gotten much better than 75% efficiency. I believe the efficiency increase is due to a finer crush on the grain. On this batch, I crushed the 2-row using my buddy's Barley Crusher, and I definitely got a finer crush than my LHBS provides. Hopefully, this brew isn't too underhopped. I think it will be fine as it isn't a hoppy style and should be well-attenuated also.