Ok so I've created a recipe with OG of 1.046. It uses 2.7kg of DME. No grains or any other adjuncts. If on the "Main" tab, under "Weight of Malt in Grams to add to bring BG up to 1.040", I do a 27L boil then, it tells me I must add 2.88kg of malt to get gravity of 1.04 for the boil.
I can see...