I brewed a nice large beer two weeks ago with 17.5 pounds of grain. The calculations said my beer should have a FG of about 1.080. I did take a pre boil sample of the wort, set it aside and let it cool down to 68 degrees. I had a 90 minute boil on this beer and when I had 20 minutes left in the boil, I remembered the sample I took and went to check it. It was at 1.055 at 68 degrees. Pretty low. This is the first time I have ever did a pre boil sample with the hydrometer. I decided to toss in some DME and put in a 1/2 a lb. At the end of the boil I rechecked the gravity and it was 1.079 at 68 degrees. Did I get lucky on this? How much different would the end boil gravity have been if I did not add the DME? I used a large yeast starter of British 1068 and I checked the gravity yesterday and it hit 1.012! I am now dry hopping it. O yea, I did a batch sparge and instead of a fly sparge. Thanks! Can't wait to drink this stuff!