Hey guys, last weekend I did my first brew day. I did a 5 gallon batch from a brewers best kit that was an IPA. Everything went well, but I think I boiled off more than a gallon in my 6 gallon boil. It looks like I have about 4.5 sitting in my carboy. It was an hour long boil. I have read that you can lose between 1-1.5 gallons per hour, so I guess I was on the high end a bit, though I did spill a little bit in the transfer to the fermenter. I'm getting ready to do the Pliny clone this weekend, and want to make sure I get the volume correct. It's got a 90 minute boil, so should I start with 6.5 gallons to be safe, or go to 7 even? What factors effect evaporation the most? Thanks in advance guys, I appreciate any responses.