The research, which updates the results from a previously published study, was conducted for the Renewable Fuels Association by Stefan Unnasch and Debasish Parida of Life Cycle Associates.
The greater-than-expected GHG savings are attributable to several factors: corn ethanol provided larger GHG reductions than anticipated by EPA; the actual carbon intensity of gasoline and diesel was worse than estimated by EPA; and use of biodiesel and renewable diesel exceeded EPA’s original expectations.