Energy out of nowhere tend to break a few laws of nature and if you do not see that I would suggest taking a few classes in basic science.
First of all, just drop this Energy out of nowhere. There is a 13 mph wind that has energy. You haven't disagreed with this fact. The question you are raising is whether this energy is accessible.
You have yet to specify any law of nature that is being broken-- but conservation of energy isn't it (since we all agree that a 13 mph wind has energy).
The energy is coming from the wind.... when you stop the wind, the car stops.
Now lets explain it a little bit more
1) A spinning propeller (spinning the right direction) will push air backwards causing an acceleration. This works when there is a tail wind (as is the case). In fact, the faster the tailwind, the greater the acceleration will be (this is where the energy is being added into the system).
There is no law of physics being broken here.
2) The wheels of a moving car being pushed forward by a spinning propeller will spin when in contact with the road. (My five year old has proven this). There is no law of physics being broken here.
3) Spinning wheels can be connected to a propeller causing the propeller to spin. There is no law of physics being broken here.
What law of physics is being broken?