Do you inflate your estimated project completion dates?

[RhinoBull]

Double!!!

You have to so you have some room for negotiation. That's how it works.
You don't want to put yourself on the spot and work long hours for no apparent reason, do you?
Some times your terms get accepted and some times they don't and that's when you start negotiating down to say ... 1.5. I never go below 1.5 of what I really need.
Ever bought a new car for MSRP? I'm sure you'd like to go below invoice...