So last time I brewed I got about a 60% efficancy, so this time I decided to overcompensate. I added a little bit extra grain to the bill. After brewing it looks like I got an 85% efficancy. I'm pysched, but with my over compensation of grain and increased efficancy my OG is a lot higher than I would have liked (was shooting for about 1.052 and got 1.063). This could have been avoided had I just not added as much DME. So my question is after mashing and sparging how can I determing what the OG is going to be. I know that I can take a reading and adjust for the temp, but my wort collection is only 3 gallons (pot size), so how can I calculate what my OG will be after I add 2.5 gallons of water for a total of 5.5 gallons?
My second qustion, how do I deteremine how much DME to add at that point in time? I guess I'm asking how do I know what each lb. of DME will add to the OG of 5.5 gallons? Thanks.