I just bought a fancy Cuisinart 12 cup machine and some fairly pricey freshly ground coffee.  The machine came with a scoop that is equal to 5 g (1 tsp).  The machine advises not to use more than 15 scoops.  75 g (2 ⅔ oz) is a dangerous amount for some reason, probably overflowing or clogging the filter basket.  Anyway, how many scoops of coffee would you recommend to make a full 12 pot? 
I worked as a coffee roaster for a number of years and met a lot of people. There is a lot of variation to this answer.   What I found works the best is 10-11 g of coffee per 6 oz cup, or 180 mL, so 12 cup maker would be 120 g. Also, the coffee should always be ground to suit the particulars of the brewing method. 