Here is an interesting article about the efficiency of converting biomass into liquid fuel, vs using it to generate electricity for EVs. http://arstechnica.com/science/news/2009/05/biofuels-can-power-more-miles-if-used-to-charge-batteries.ars
Biofuel
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Check out this advanced SVO filer setup on youtube. This guy uses two 55 gal drums and six (6) filters! I like the site level idea.