In beersmith what do I enter for Boil volume? My first inclination was to enter my total volume prior to the boil (7.5 gal). But since I don't add the hops until there is 60 minutes left in the boil and ~6.5 gallons should I enter that for the boil volume instead? Or does beersmith use the boil off rate and the time of the hop addition to come up with an accurate IBU number?