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How about, let's say for a front drive auto, make an electrically driven rear axle, battery pack and controller. Integrate generator into ICE at front that will cycle on and off as needed to keep batteries topped off ( ala Volt ), and drive the car primarily on electricity.
If problems arise with the electric side, use existing drivetrain as limp home or for long distances, electric side for running around town.
As a third level of redundancy, the big hp / torque starter motor, just in case.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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