Bottled 17l of beer. Added sugar to reach 3.5 volumes of CO2.
Based on boiling 26.70 gallonsliters at 1.049 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.051. You were planning on an OG of 1.051 so you are right on track. Nice job!