-Kites and turbines are different things.
-The turbine is not deployed when the car is moving. Doing so would only lose more energy than was gained, per the 2nd law of thermodynamics.
-The kite is used to pull the car only by the force of the wind, it is not connected to the electric system at all.
-The 20% charge per hour is only when the car is plugged in, that's what "the grid" refers to.
-I know, I'm a prick.