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Oil extended gains from the highest close in seven weeks as industry data showed U.S. crude stockpiles plunged, easing a glut.

More clean diesel trucks are a part of the nation’s fleet, subsequently yielding lower emissions and greater fuel savings, new research shows.

The U.S. average retail price of diesel rose 1.6 cents to $2.507 as crude prices inched up toward $47 a barrel after Saudi Arabia said it would make additional cuts in its own production.

Cummins Inc. recently endorsed two fuel additives, marking the first time the diesel engine maker has taken such a step.

A T880S mixer fueled by compressed natural gas and a T880 dump truck take to the course at Dirtfish in Snoqualmie, Wash., during Kenworth Truck Co.'s ride and drive of vocational vehicles July 21, 2017.

Oil declined after tanker-tracker Petro-Logistics SA said OPEC’s supply in July will be the highest this year.

The U.S. average diesel price rose 1 cent to $2.491, the Department of Energy said July 17.

Congress hasn’t raised the federal gas tax since 1993 when Bill Clinton was president, but a narrow majority of Americans would support an increase to help fix crumbling roads and bridges in their own states.

The EPA has proposed cutting back on the minimum required volume of renewable fuels produced in 2018 and putting the brakes on the minimum volume of biomass-based diesel produced in the United States in 2019.

Oil was steady amid mixed signals on U.S. crude inventories, with industry data showing supplies increased last week while government statistics were expected to show a decline.