When I worked at McD's, in the late 80s, coffee was supposed to
brew at 180 degrees F and be served at 140-160 degF. (It's
possible--even likely--that I'm misremembering the 180 and it
should be 190). I'm wondering whether they changed it after I left,
or if the cases came from McD workers filling the cup directly from
the brew spout instead of from the pot (as I know sometimes
happened at the one where I worked when there wasn't any coffee
ready).
Also, last time I saw this come up, I thought some said that the
point of the hotter temperature was to use less coffee grounds,
rather than to keep the coffee longer.
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