Japanese toilet manufacturer Toto has made a motorized tricycle with a toilet for a seat. It runs completely on the driver’s feces, which is deposited directly into the machine.  The bike is driving from the southern tip of Japan to Tokyo to raise awareness for Toto’s efforts to reduce CO2 emissions.

The trip is over 600 miles. The journey will take a month, which may not seem efficient compared to more traditional modes of transport. However, combining food breaks and gas stops really must cut down on time.

http://www.huffingtonpost.com/2011/10/07/poop-powered-bike-japanese-toto_n_1000111.html