I was curious about a direct comparison of the Volt to Prius vehicle dynamics. I did a macro model analysis comparison of their extremum conditions and plotted the results. This nicely illustrates some aspects of the series vs. parallel hybrid tradeoffs. One of the plots is shown below. The details of the analysis are at http://www.leapcad.com/Transportation/Macro Model Performance Comparison - Volt EREV vs Prius.pdf. The analysis reveals that the Prius makes very efficient use of its tractive components. Efficiency with respect to ICE duty cycling, is of course, depends upon miles between plug-ins. I welcome all additions/corrections, particularly about the Prius assumptions and Volt All-Generator-Mode considerations.