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On a race car you'd only need it on the straightaways at higher speeds. Under braking, the extra drag would be useful. The car would also use a sort of regenerative braking...simply pump up the air tank with a wheel driven air pump.
On a car driven at highway speeds for long periods of time, you'd have to see if it was better to burn fuel to make X amount of horsepower to go a target speed or better to reduce the amount of horsepower required by reducing drag and then burn fuel to (somehow) make your compressed air contraption work.
Still...I don't think it would be that difficult to duct the inside of the rear wheel wells to the back of the trunk. That should be a straightforward HIGH pressure to LOW pressure job.
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