New studies show ethanol-blended gasoline has lower CI than originally thought

In Texas, two studies conducted by Transport Energy Strategies (TES) and THiggins Energy Consulting show that gasoline blended with ethanol lowers carbon intensity (CI) even more than what is modeled today and what is shown in recent studies. The first study addresses tailpipe carbon emissions, the second well to wheels GHG effects. A key finding in both studies is that blended ethanol not only displaces some of the gasoline but enables a reduction of aromatics in all of the gasoline in the blend. Aromatics have a high CI, and their reduction further decreases the GHG impact of the E10. This advantageous blending attribute is due to ethanol’s high octane rating and has been neglected in prior literature.