  Thermodynamic uncertainty relations (TURs) relate precision to the
dissipation rate, yet the inequalities can be far from saturation. Indeed, in
catenane molecular motor simulations, we record precision far below the TUR
limit. We further show that this inefficiency can be anticipated by four
physical parameters: the thermodynamic driving force, fuel decomposition rate,
coupling between fuel decomposition and motor motion, and rate of undriven
motor motion. The physical insights might assist in designing molecular motors
in the future.
