I just did 5 consecutive dry runs (water only) and got the same results 5 times in a row. After filling with 4 gallons of water (just what was handy) and draining back into my carboy my 15 gallon Blichmann Boilermaker leaves behind .75 cups of water and my 10 gallon Igloo converted mash tun with false bottom leaves 3 cups of water behind. I understand that trub/wort/hops have an effect on the actual amount of liquid left behind. I did one batch with this new equipment and ended up not boiling off anywhere near I anticipated. What would be a good "educated" amount to input for kettle loss and mash tun loss into my brew software?