  We present a detailed analysis of binary black hole evolutions in the last
orbit, and demonstrate consistent and convergent results for the trajectories
of the individual bodies. The gauge choice can significantly affect the overall
accuracy of the evolution. It is possible to reconcile certain gauge dependent
discrepancies by examining the convergence limit. We illustrate these results
using an initial data set recently evolved by Bruegmann (Phys. Rev. Lett. 92,
211101). For our highest resolution and most accurate gauge, we estimate the
duration of this data set's last orbit to be approximately $59 M_{ADM}$.
