A drive-train for a fuel-efficient wheeled vehicle includes a first internal combustion engine and a second internal combustion engine of lesser power adapted to drive a generator. An electric motor is adapted to drive the vehicle primarily during cruising mode operation. The first engine is employed primarily to provide maximal power to the vehicle for acceleration, hill-climbing and towing. The power from both the motor and first engine can be selectively combined for varied conditions of operation of the vehicle.

 
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> Vehicle driving system with adaptive skid control

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