We do all the time. The favorite term is "making fuel". The closer you get to destination, the higher the predicted fuel at landing is.Winner Winner! This is pretty darn close.
Only one thing I will add to this from a dispatch perspective. It always seems as if pilots are to trusting of the FMC. If all of your burns were matching up with the flight plan cross check but your FMC was off. You talk with dispatch and they cross check the burn and run you a new flight plan and everything they advise say continue.
Honestly I want real answers. How many of you could go against the FMC?
Usually on a Long flight we will be flying with the check designation fuel message for at least the first half of it. We just check the segment fuel against the plan and go from there.