Quote Originally Posted by 420ultimatesmokage
it takes more energy to split the water then you get back from it. one couldn't get any energy from the system due to the law of conservation of energy. what you put in is what you get back out. there are no such thing as free energy machines.
Exactly.

He says "It is easy to split hydrogen from water; all you need are carbon rods, water and a current."

So he himself is admitting that the car is not running on water or hydrogen but carbon, hydrogen from water and the "current" it takes to get the hydrogen out of the water in the first place. And that current has to come from some place, the wall etc. Which of course is originally made from burning coal in most cities and countries.

One of the first laws of physics is what you just said, what you put in is what you get back out.