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Four House Democrats have asked the Environmental Protection Agency Inspector General to investigate a glider truck study by a Tennessee Tech University researcher. The study already is the subject of a research misconduct investigation by the university.

WASHINGTON — The Trump administration is moving to allow year-round sales of gasoline with higher blends of ethanol, a boon for Iowa and other farm states that have pushed for greater sales of the corn-based fuel.

The U.S. average retail price of diesel jumped 7.2 cents to $3.385 a gallon as oil prices remained at levels not seen in four years over supply concerns. The increase was the seventh consecutive weekly rise for diesel, and the fuel has risen 17.8 cents a gallon since Aug. 20.

Exxon Mobil Corp. is putting $1 million into a political campaign that, if successful, would effectively spawn a tax tied to the company’s core products.

Love’s Travel Stops now offers its own private-label diesel exhaust fluid in a 2½-gallon container for auto diesel customers and professional truck drivers.

Natso, the national association representing the travel plaza and truck stop industry, and its newly launched Alternative Fuels Council initiated a renewable identification numbers management service Oct. 1.

California is considering a formal, public counter-proposal to President Donald Trump’s proposed rollback of fuel and pollution requirements for cars and trucks.

TRAVERSE CITY, Mich. — Michigan Gov. Rick Snyder’s administration and Canadian pipeline giant Enbridge have agreed to replace twin 65-year-old crude oil pipes in a channel linking two of the Great Lakes with another that would run through a tunnel far below the lake bed.

A $4.6 billion shale gas pipeline that already has been delayed by about a year is facing another setback after a court vacated a key permit.