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I'm not saying that you can regain even a majority of the kinetic energy in an IC engined vehicle. But you can reclaim *some* of it it any vehicle.
All four factors are interrelated. But the relative order of importance is still:
* Drivetrain Efficiency
* Aerodynamic Drag
* Weight
* Rolling Efficiency
...for almost all vehicles in most typical situations. It is interesting too, that ICE's "like" a constant load best (fixed speed on flat ground) while an EV does very well with stop and go, because there is no idling, they are still quite efficient at low RPM's under high load, and regenerative braking is possible.
Both ICE's and EV's need low aero drag, for slightly different reasons: and ICE has to minimize the load for efficiency, while an EV is limited by range. For weight, as I said before, the EV loses much less under acceleration, and it can coast better (no idling) and it has much greater capacity of regenerative braking.
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