I brewed an english IPA this morning and most things felt pretty good up until I took a OG sample. It was way off, estimated OG was 1.054 but it landed on 1.042 So it's going to be a pretty low ABV IPA and that's ok with me, doesn't bother me too much even if I'm wondering what went wrong...I didn't take a preboil sample this time... of course.. which I usually do. So I can't say if it was my mash efficiency that failed, but I suppose thats the most likely cause. I have had on my last brews a pretty good efficiency, close to 80%, and I didnt really do anything different this time...same kind of crushing and same kind of squeezing (BIAB) and sparging. Anyway...my actual concern and question is this: my hopping schedule was calculated and done with the higher OG in mind, set for an IBU at around 42. How would such a big miss in gravity affect the bitterness of the beer? Much bitter of course, but would it be undrinkable? Funny thing is, I do take a tasting sample when I take the OG, and usually I think it's too bitter (I haven't really got the hang of extrapolating tasting samples to what finished beer would taste like..). BUT...this sample wasnt bitter at all, quite pleasant, and much sweeter than I usually think my beers are at this stage. So I'm not sure what to think, guess it's just wait and see?