  This paper investigates the effect of the powertrain efficiency map on energy
optimal speed trajectories, especially stop-to-stop trajectories. A variety of
different efficiency maps are explored and the energy optimization process is
carried out. It is shown that while the efficiency maps can have a significant
impact on the overall transportation energy, they have little impact on the
shape of the optimal speed profiles. A number of very different efficiency maps
and their effects on speed trajectories are illustrated. Also, the impact that
vehicle and segment parameters as well as average speeds have on the savings
are investigated. This paper also presents the impact of transient penalty on
the shape of the energy optimal trajectories and associated savings. It is
observed that, by adding an additional transient penalty to the energy balance,
the shape of trajectories changes and energy savings decrease.
