bt
avengmil has 10200 pop.. so roughly 20 bushels a day consumed (21 according to marketplace.php).
it has a food rating of 135 and produces (according to marketplace.php) 19 bushels a day
atm.. >100% production
135/7 ~19
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so to use your figures
73307/500 -> ~147 bushels per day
1556/7 -> ~222 bushels
222/147 ->1.51