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With a windmill like that you wouldn't get more than 100% efficiency if it was always running, if you could find a way to make it not drag when you are cruising or accelerating and only spin while slowing down or while the car is off (pretty much anytime you aren't using the battery) it could work. I saw a video of a new type of windmill that looks promising and you might be able to put it on the bottom of your car and actually get more energy while driving than you are spending if the conditions are right.
I can't find the link to the video but it was basically just a sting that had magnets on the end that would vibrate up and down when wind was blown on it (like if you take a piece of string and blow on it the string will go up and down). As it blows up and down the magnets produce a charge with copper coils.
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