Originally Posted by hinke
Changing my efficiency in Beer Smith does not seem to have any effect.
That's strange. Changing efficiency should definitely have an impact on the gravity.
wait! is this an extract batch or an all-grain batch?
If it's extract, then I think the problem is just what the software assumes you are going to get from each pound of extract. Each brand of extract is different, and will have a different "potential" for adding to your gravity.