my bad, I should have provided more background info...but yea, i did measure my volume...I had collected 3.5 gallons at pre-boil. After a 60 minute boil, I had 3 gallons remaining in my kettle at which point I added 2 gallons of bottled water to the fermenter, the added the remaining 3 gallons...
I have moved on from Extract brewing into Partial Mash brewing and have done several batches now. The first few, I didn't measure my pre-boil gravity as I was using recipes from BYO and it didn't mention anything about pre-boil gravity...I would still hit the Target OG within a few points...