IMO the OP is obviously changing the facts to make him appear in a better light... lets think about this logically. He picked up his mate/worker... and the guy waited until he got all the way to work to tell him he'd had a few beers? Unlikely. Very unlikely. As the OP originally originally said, he likely told him soon after he got in the car (because you would tell the other person how you were doing within the first couple of minutes of greeting them, its natural behaviour), and then the OP sat chewing on it uncomfortably all the way to work, before deciding to dob him in. There is no good reason whatsoever that the OP would say he was told in the car, and then change it to say that it was in fact at work, unless he was trying to make us be more forgiving. To me it seems like pretty basic psychology anyway.
Exactly, this clearly makes the mose sense.