I was thinking about this earlier after grinding a 15 lb grain bill for my next IPA by hand. I fully expect to end up with 1.07ish OG. That's a lot of malty goodness left behind in the mashtun. Perhaps enough for a small ale or something. I consider that wasted effort. Every beer that I put down doesn't need to be 100 IBU and 8%+ ABV. So do you ever use second runnings to make another beer? What are your guidelines? I'm thinking that as long as I can get at least 5 gallons out at 1.04ish it'll be worthwhile. I wouldn't even mind compensating with some DME to get the wort to a respectable OG.