I think you're just to assume that the amount taken would be if everyone in your tribe ran over and grabbed some grub. I noticed the more villagers I have - the more grub went missing. Also - what I wonder is... how often does it refresh that it takes the grub? Is it once an hour or more? I remember struggling to get my Foodages up because it seemed like each time any villager went to the bin - no matter to eat or to deposit - the grub would go away!!
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iMuggle & the fat hobbit knows
{Twihater}