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I can’t make an accurate guess, but check a safety data sheet from an existing antifreeze product and see how much methanol they have in there. They often list the percentage of the ingredients or at the very least a range of the percentage - like 5-10%. That should give you a starting point.
It's quite a bit of methanol required in the final dilution, depending on how much freeze protection you are looking for. This is a chart we reference to get a rough idea of tips for the hydrominder.