E15 | Michigan Radio
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E15

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The Trump administration says it will allow sales of gasoline with 15% ethanol in it year-round, and it says that will give customers more choices at the pump.

Former administrations banned its sale during the summer, says David DeGennaro of the National Wildlife Federation.

"And that's because ethanol in gasoline actually increases the amount of smog relative to gasoline with no ethanol in it," says DeGennnaro.

The U.S. Environmental Protection Agency says gas stations can now sell gasoline blended with 15% ethanol for all cars built in 2001 or after. Right now, when you fill up in Michigan, your gasoline has 10% ethanol.

The EPA says E15 gasoline will help reduce our need for foreign oil. Ethanol is made from plants like corn. The EPA only tested the effects of E15 on emissions and catalytic converters.

But ethanol is corrosive. Patrick Kelly is with the American Petroleum Institute.

Lincolnway Ethanol plant in Nevada, Iowa
flickr user - freddthompson

Fuel-makers blend refined gasoline with ethanol to make it burn more cleanly.

Corn-based ethanol has been considered a much better fuel additive since MTBE was found leaking into groundwater supplies (the CBS News magazine 60 Minutes did a report that led to MTBE's downfall as an additive).

But there's been debate on how much ethanol to allow in gas. The accepted standard has been a 10% mix, which is found in most gas across the country.