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our team of scientists, engineers, policy experts, lawyers and computer programmers pores over government data, legal documents, scientific studies and our own laboratory tests to expose threats to your health and the environment, and to find solutions. Our research brings to light unsettling facts that you have a right to know.
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Ethanol Guide: Ethanol Guide
Which blend to choose?
EWG's handy wallet-sized card lists various ethanol blends and which vehicles/engines can safely use them. Click here to print.
If you are interested in the dangers of higher ethanol blends to your health and your engine's performance, read EWG's report about transportation fuel that is 15 percent ethanol, known as E15. Since ethanol is more corrosive than gasoline, two studies by the National Renewable Energy Laboratory have found that E15 may cause valves to crack, certain air emissions to increase, engine temperatures to rise and fuel efficiency to fall.
References:
http://www.nrel.gov/docs/fy12osti/52909.pdf
http://www.nrel.gov/docs/fy12osti/52577.pdf
Environmental Working Group /// February 17, 2012