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I can scarcely believe that EROEI for biofuels is negative. Can you provide source for this?

EROEI of 1.07 from this metastudy for Corn Ethanol.

Society needs at least an EROEI of 3:1, so corn ethanol, at least, is a boondoggle.

I'm not sure how much I can trust that document. It's written by some academics, they might or might not have an agenda.

Here's a study done by the USDA, published in 2016 and describing the state of the affairs in 2015

Bottom line: ignoring any carbon credits, the return on energy using the existing facilities in Iowa is 2.3 (page 14, bottom of 3rd column).

See [1]. Numbers vary, but ethanol from corn seems to be in the 0.5 to 1.5 range. Which is not very good.