Gas+4Cars

We have a problem, The world is polluted with burnt gas from cars that use gas as a fuel. Wouldn’t it be cool if there were a car that would not pollute the world as much? I want to design a car that will reuse the exhaust gas from the tail pipe as a secondary fuel source for running the car. I fill my car with gas, when the gas burns the waste goes through a pipe and there is a device in my car and it converts the burnt gas into useable fuel for my car. The car then runs off of the converted fuel and I could drive the car more than a normal car with the same amount of gas. My car is very good because it will have less pollution. The waste will be cleaner when you let it out because it has been filtrated many times.