I still haven't found the "best" answer for that yet myself. Not counting bakery, beverage, or candy type lemons, I have 5 lemon-only concentrates in my current stash; Italian Lemon Sicily-CAP, Juicy Lemon-CAP, Lemon-INW, Lemon-TFA, and Lemon Sicily-FA, and I am playing with the combining of 2, or 3, of them which does seem to add some longevity to the mix. I am still far from being able to offer any opinion regarding what percentages, of which pair/trio might be best; but depending on what you have in your own inventory, you might want to experiment along similar lines.
