Apparently there are VW Beetle's out there that are rigged to run on biogas, which is methane gas generated from human waste during the sewage treatment process. It's aptly named the Bio-Bug. I just wonder how you re-fill the tank, do you have to swing by the local sewage treatment plant?
http://fastflip.googlelabs.com/view?q=view%3Apopular&a=WBFCSxVHgx-MgM&source=news&type=embed
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