Don't forget that you can subtract one drink or beer for each hour you spend at the party or whatever, so a guy of average weight could drink 6 beers at a three hour afternoon BBQ and still be OK driving home.
Coffee will not effect your BAC or reaction time, but I believe a wide awake drunk is better than a sleepy one.
I was only CUT OFF one time in my life, the restaurants and bars and waitresses make a living on booze markup.
There's the urban legend about the cops pulling over an eighty year old man for driving too slow, and he blows a number in the breathylizer that says he is legally dead, even though he can talk and appears pretty normal. They don't make guys like that anymore.
BE SAFE!! DON'T DRINK and DRIVE!!!
Signal 30 (1959) **WARNING! Graphic Depictions of Death!** - YouTube
Sam Kinison - Rock Against Drugs - YouTube