There's a huge difference. In one case, the car is displacing all of that air; in the other, you are. Now, sure, an aerodynamic shell helps with that, but you s

There's a huge difference. In one case, the car is displacing all of that air; in the other, you are. Now, sure, an aerodynamic shell helps with that, but you still have to be the one to displace that air mass, while with a car you have a powered source doing so.