From the Tanzania Government coffee building (Kahawa House)....http://www.tca.or.tz/
Just measured my daily ritual, 2 heaping scoops/26gms/0.9oz - to - 1/2 cup of water/4fl. oz./125ml, perfect for me. Gives me almost eigthteen 4oz. cups per pound of coffee (using an Aeropress and a Hario Mini Mill).
My wife uses the same amount of coffee but with 1 1/4 cups/10 fl. oz./ 300ml of water, kinda weak to my tastebuds.
Coffee we explore comes from the various local roasters/venders we come across in our daily wanderings.
Out of curiousity went back and measured the four coffees we have on hand and the weights, per level scoop were from 10g - 16g. The heaviest being the lightest roast, the 10g roast and the one i initially measured up top, is also our darkest roast. Lighter roasts are going to result in fewer then 18 cups per pound of coffee, sold by weight but used by volume.
dave
edit. Tanzania, 20fl. oz pint or a 16fl. oz. pint?