haʊˈɛvɚ, dˈuː tʊ ˈɪŋkɹiːsᵻz ɪn kˈɔːɹn kɹˈɑːp jˈiːld ænd mˈoːɹ ɪfˈɪʃənt fˈɑːɹmɪŋ pɹˈæktɪsᵻz kˈɔːɹn ˈɛθɐnˌɑːl hæd ɡˈeɪnd ˈɛnɚdʒi ɪfˈɪʃənsi
However, due to increases in corn crop yield and more efficient farming practices corn ethanol had gained energy efficiency