Somtimes I wonder if the JWs weren't on to something with their "it isn't lying if the person is not owed the truth". I'm sure I paraprhased that statement a bit.
I personally tend to be too honest.
Pointy haired boss: Hey so how do you like our shiny new product that we are banking on for making our numbers in the next quarter?
Me: It sucks!
I don't see a problem with creative truth telling. In my opinion a company has no right asking you how much you got paid at your last job so I wouln't have any problems adding in my 401k match, vacation time and rounding to make it look a little better.
Also, although i'm not very good at this, it is possible to answer without actualy answering. Lots of ideas for that on the internet.
In the end you need to live with yourself so I say test the waters to see where your boundries are.