Green BS

Another potential green bs from Honda. Q to the all mighty:

1. What is the saving if the car is traveling on the average of 25mpg (LA scenario)?
   
2. How much weight this system adds?
3. Any additional services?
4. How long will this system last without service?

I don't want to bus additional 30lb of dead weight when the system is out of commission (since the repair might cost more than the car itself).