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The problem with using an airplane as a ground vehicle - is the wheels and the ground. The ground very much changes the aerodynamics, because the ground constricts the air flow under the car; and the wheels have to be exposed at least enough for the suspension to work.
I'll also mention that Mercedes did a study comparing single form cars to cars with outboard wheels, and they found that the latter was inherently higher drag. Air flows around the wheels interacts with the air that is being pushed out and around the main body, and this will always be worse. Also, where the suspension (or its covering) intersects with the wheels and the main body increases the drag.
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