A three-wheeled leaning passenger vehicle comprises a frame rigidly mounting a passenger seat; a
drive wheel rotatably mounted on the frame preferably in a rearward region thereof; a frame-mounted rotary drive cooperatively coupled with the
drive wheel for rotation of the
drive wheel relative to the frame; and a frame-mounted coast / steer
system including two rotatable and preferably front wheels freely rotatable relative to the frame in a forward region thereof, and a handlebar coupled with the two front wheels for turning the two rotatable wheels in a plane defined by their rotational axes substantially parallel with one another to corner, the vehicle being configured to substantially freely lean left and right in a natural response to a driver thereof in the driver seat steering the vehicle and leaning respectively left and right, and, alternatively or additionally, to have controlled leaning in response to a hydraulically or otherwise provisioned leaning, suspension, and stand-up mechanisms. The rotary drive includes a frame-mounted power
plant operatively couple-able with the drive wheel, the rotary drive including an
internal combustion engine and an
electric motor selectively operatively couple-able with the drive wheel to power the vehicle. The power
plant is selectively operable to power the vehicle in three
modes of operation including a
hybrid mode characterized by operation of the
internal combustion engine and the
electric motor coordinated substantially to optimize fuel economy, an electric-only mode characterized by operation only of the
electric motor, and a sport mode characterized by concurrent operation of the
internal combustion engine and the electric motor.