I would assume you refer to using 20% methanol as a normal amount to get a fairly complete reaction. I did the numbers on a stiochiometric amount of methanol to get 100% reaction in the past, it was about 12.5%. I'm not clear on the exact quantities present or if there's a possibility of wet oil or wet methanol. Test the oil with a hot pan test if a few drops are left in the container. I found my notes on the stoichiometric amount of methanol to react 1 litre of lard, it is 119.9 milliliters of methanol.
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