Originally Posted by greatschmaltez
All efficiency calls should take into account boil off volume. It's asked on total amount of "points" recovered... That being said, if you aren't measuring your final volume then that may be an issue.
This is true, but that's not the point he was making. Higher boiloff rate = larger preboil volume = more available sparge water = higher efficiency in some cases.
The main reason most people see crappier efficiency with huge beers is because there's less available sparge water per pound of grain, and that's why a commonly used technique is to sparge with extra water and do an extended boil for those beers.