Hi All, I bottle mainly in 2 litre PET bottles these days. If I fill them to just 3mm from the top, the space volume above the beer is close to 1 ml. However my normal bottling free space is about 7 cm which is a 10 ml head space. So the amount of CO2 from bottle fermentation to pressurise each of these two bottles is very different. Is there a table anywhere that takes account of head space volume ? Thanks.