The energy balance isn't particularly meaningful anyway, and pays no attention to the kind of energy used (electricity vs oil for example). And it is useful to note that the energy balance for gasoline is quite negative.
But if you would like to know, you can look at the EPA's rule making for the Renewable Fuel Standard http://www.epa.gov/otaq/renewablefuels/
Or this paper http://www.pnas.org/cgi/content/abstract/103/30/11 206 published in the proceedings of the national academy of science is also a credible source.
These are all fairly comprehensive and fairly consistent with the 1.3 to 1.0 ratio.
Costs are probably the best measure actually, (if we properly account for government subsidies and externality costs such as environmental or otherwise). Most credible estimates find that externality costs very roughly equal government subsides, so actually they cancel each other out.
Slashdot Mirror
The energy balance isn't particularly meaningful anyway, and pays no attention to the kind of energy used (electricity vs oil for example). And it is useful to note that the energy balance for gasoline is quite negative. But if you would like to know, you can look at the EPA's rule making for the Renewable Fuel Standard http://www.epa.gov/otaq/renewablefuels/ Or this paper http://www.pnas.org/cgi/content/abstract/103/30/11 206 published in the proceedings of the national academy of science is also a credible source.
These are all fairly comprehensive and fairly consistent with the 1.3 to 1.0 ratio.
Costs are probably the best measure actually, (if we properly account for government subsidies and externality costs such as environmental or otherwise). Most credible estimates find that externality costs very roughly equal government subsides, so actually they cancel each other out.