ɪn tˈuː θˈaʊzənd sˈɪks ɐ stˈʌdi fɹʌmðə jˌuːnɪvˈɜːsᵻɾi ʌv mˌɪnɪsˈoʊɾə fˈaʊnd ðæt kˈɔːɹŋɡɹˈeɪn ˈɛθɐnˌɑːl pɹədˈuːst wˈʌn.twˈɛnti fˈaɪv jˈuːnɪts ʌv ˈɛnɚdʒi pɜː jˈuːnɪt pˌʊt ˈɪn.
In 2006 a study from the University of Minnesota found that corn-grain ethanol produced 1.25 units of energy per unit put in.