Well, I do three mugs, maybe 12 oz each, with skim milk in them... I can drink much more than that if I don't watch myself. Luckily coffee is good for you and low in calories!
I've packed it in. I used to work with a guy who smelt of coffee he drank so much. Put me off for good.
I am a tea tottler, can't live with Tea, usually had 5-9 cups of tea every day................it boosts my concentration
Around 11-15 cups/day, but I must stop after 21:00, if not I cannot sleep. However, I'm trying to switch over to tea.