NOVELTY - An energy efficient land vehicle has a supplemental electric power generation system with at least one set of rotatable blades mounted within the housing. Rotatable blades are moved by wind speed created by movement of land vehicle when vehicle is decelerating and at least one gate is open so that movable shaft is rapidly rotated causing a generator to impart electricity to at least one storage battery through the voltage regulator by which power consuming mechanism is indirectly powered by generator so that electrical load on storage battery is reduced.    USE - Energy efficient land vehicle e.g. small passenger vehicle, large passenger vehicle.    ADVANTAGE - Utilization of more engine power in propelling the vehicle is enabled by permitting the alternator to be used less. Enables storage of generated electricity in auxiliary batteries used to power ancillary vehicle systems and accessories. Efficiency of vehicles with internal combustion engines is improved and negative effects commonly associated with vehicles having internal combustion engines are lessened by reducing the electrical drain on vehicle. The system is simplified since comparative circuit required by the motion and pressure sensors to determine acceleration and deceleration is eliminated. Vehicle safety is improved since wind resistance added by the wind turbines aids in slowing the vehicle. The lack of additional components such as external generator or transmission system greatly simplifies the wind turbine design and reduces the need for system maintenance since peripheral power generating wind turbines are capable of producing useable electricity at much lower wind speeds than most other turbine designs thus ideal for use in low wind applications. Efficiency of vehicle during wider range of operating conditions is improved since each individual turbine is capable of rotation independent of the turbine array to allow the device to respond to more local changes in wind direction caused by outside influences such as turbulence from passing vehicles or obstructions to the flow or wind.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the key components and configurations for each component of an energy efficient land vehicle.    Vehicle power mechanism (1)    Housing configurations (3)    Gate options (5)    Blade configurations (7)    Generator options (9)