most cars a running an alternator, this is normaly belt driven from the engine and draws a couple of Hp to keep the battery charged. putting generators on the wheel would just requir the engine to work harder. However theres nothing stopping you regaining some of the enregy lost in braking. F1 are currently looking into KERS (kinetic energy recovery systems) as a way store the kinetic energy lost in braking into chemical energy in batterys for a later time
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