I really do not have much knowledge of engineering principles. I know that turbines do add drag and that with a gas vehicle would not be efficient, but when solar and electricity are use even a small wind driven generator, it seems to me, could be used to provide power to the non propulsion systems, such as the radio, the headlights, brake lights, etcetera, I remember as a kid a small clip down on the bike wheel for running the headlight on my tenspeed, not a big generator, but enough to run the light.
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Because the bicycle was muscle powered. The energy generated that way is not free, it comes from your body. Adding a wind turbine to an electric car, even to power non-propulsion systems, is pointless since it costs energy from the car's propulsion battery to move the car in order to make the turbine spin. The energy still ultimately comes from the main battery, you've just added an unnecessary conversion step in between. It would be less wasteful just to power all that stuff from the main battery, which is why that's how all electric cars do it.
Solar is a different story though and makes good sense. There exist electric cars with solar roofs for powering a heat pump, which keeps the temperature inside the car from getting too high when it's left parked outside in bright sunlight.