Lets say youre making a somewhat big beer (OG above 1.070), and you want to make a starter. You make a two liter starter the day before and pitch the entire thing into your wort.
Wouldnt this mean that whatever gravity that you took just prior to pitching would be slightly high?
In other words, if there are roughly 19 liters in a five gallon batch, and you draw your sample for an OG hydrometer reading from those 19 gallons, wouldnt that reading change after adding 2 liters of starter (w/ an OG of 1.040)? The more dilute, 1.040 starter (2 liters) would mix with the 1.070 brew (19 liters), resulting in an OG lower than 1.070, right?
If so, how does one get a fully accurate OG reading when using two liter starters? Would you simply average it out? (i.e. [1.040*2 + 1.070*19] / 2 = 1.068).
I realize that this may be a bit technical, and that the effect of adding two liters of 1.040 liquid to 19 liters of 1.070 liquid might not drop the OG that much. Nevertheless, I was wondering what you all thought.