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biodeisel is pretty close -- 7-9% lower per this source:

http://www.biodiesel.org/pdf_files/Biodiesel_Blends_Above%20_20_Final.pdf

I'd be willing to bet if energy/gallon were critical, they're be a few PhD ChE's who'd develop ways to close that gap.  But I'd guess the real issue is energy/mass since how much mass you have to haul around hits your econs more than stretching a fuel tank's size a bit.

by HiD on Sun Oct 28th, 2007 at 11:13:54 PM EST
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