I wasn't sure where to post this, so I posted it here since it affected my efficiency calcs.
I did a no mash out, no sparge brew yesterday, it was a half batch and I had about 3 gallons go into the boil. I swear out of the boil I was far less than 2 gallons. My OG into boil was 1.039 and out of it 1.060 if that tells you anything.
Beersmith has 9% boil off per 60 minutes.
I boiled off maybe 30%.