Life-cycle energy use and greenhouse gas emissions of production of bioethanol from sorghum in the United States

Table 2 Reductions (%) of WTW fossil energy use and GHG emissions by sorghum-based ethanol, relative to gasoline

		I	II	III(a)	III(b)	IV	V(a)	V(b)
Fossil energy	Mean	57	83	82	84	66	77	78
Fossil energy	Range^a	52–63	78–88	80–86	81–88	58–73	74–81	75–82
GHG	Mean	35	56	71	72	49	70	72
GHG	Range^a	−3–60	18–83	55–82	57–84	28–65	57–80	58–82

^a The lower bound of the range is the ratio of the difference of the P10 value of the baseline gasoline and the P90 value of each pathway to the P10 value of gasoline. The upper bound of the range is the ratio of the difference of the P90 value of gasoline and the P10 value of each pathway to the P90 value of gasoline.

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