Then why add it to gasoline? If it was so green all cars should be running on it then without fossil fuel. It costs more to make ethanol from corn than what it costs to pump oil and refine it. Secondly, how can it be renewable if it is burned in an engine? Can you reclaim it and use it over again? A chemical transference (in this case burned as fuel) it is converted to heat which is dissipated into the air. How are you going to get it back?
The term "renewable energy" is so over used. Once it's used, it's gone.