Did you know there was a POOP POWERED MOTORCYCLE?
Why go green, when you can go brown?
I'm sure you will all be shocked to learn: This is a Japanese born product. Created by Japan's largest toilet manufacturer TOTO.
Thankfully, they had the good sense to make the seat the gas tank - so you can "fuel" your bike up without having to stop.
And the mileage is ASStronomical! :)