I'm a big fan of using "real" values myself, so I would normally completely vote for your approach anyway, but with the obvious integration to TAC LS, together with the popularity of TAC LS, this manual adjustments are simply no real option for the long run. I only see 2 alternatives here (well, 2.5 maybe), otherwise I think this mod will be doomed to be mainly ignored. Get in contact with the TAC LS people and convince them to change their "Kerbalday units" to the real stuff. That would of course be optimal, but would ruin usability ("I'm in space for 300 days, so for 3 Kerbals I need 900 worth of everything") and most likely compatibility between TAC versions... Definitely the toughest way to go with the most beautiful ending. Change your mod to use the TAC day-units. From what I read here, you already worked out all the real formulas based of real units, and you know how much of everything a Kerbal needs per day, so my question is: is it really that hard to apply a fixed unit conversion from what you currently have to these day-units at the end? Sure, this truly "masks" all your effort, you put into your scientifically sound system, but you instantly have full compatibility with TAC, no more number adjusting, and you gain this nice usability of being able to directly see "OK, my Kerbals will survive another week before I have to dock with my hydroponic station again". This is the half point, as I'm not sure if this is technically possible: You could add some kind of detection to your mod, to see if TAC LS is installed, and automatically adjust all the required numbers (storage, consumption, command pods, EVA etc.). I'll probably keep a keen eye on this nonetheless and try using it every now and then, but for now I fear I'll just keep this mod around for it's beautiful experiments, while sticking with regular TAC when it comes to feeding my Kerbonauts...