More or less efficiency was not considered.
What is being considered is the storage capacity of a battery and/or a large capacitor to supply enough energy to "move" the car for about 300 miles.
The conversion of the available power to the "energy mover = motor" is what is considered in regards of difficulties, easy to convert and/or the problems in regards to the conversion of a high voltage to the "energy mover" requirements.
The efficiencies of one type to the other may considered, like about 33% for the gas engine to the "motor + conversion" that could reach around 80 %.
One needs to examine the overall loop efficiency, from generating the energy ( well etc or hydro or nuclear or even coal or gas generators) to the ultimate use of such energy "material " and its costs.
Also the storage capacity versus volume and weight of such storage.
The Hybrid system, large Battery + small gas engine is one step to improve the efficiency of the system compared to the gas engine alone which could reach around 40 to 50 % or maybe a bit more.
A single large capacitor energy storage from the generating the energy to the energy going into the wheels to move the vehicle could reach something like an overall 60 to 65 + % efficiency.
I could extend myself here for a long rant, better stop.
Nando
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