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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).