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

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.

The U.S. average diesel price has risen a cent to $2.491, the Department of Energy said July 17. The fuel has increased 2.6 cents over three weeks.

South Carolina on July 1 began a six-year trek that will raise taxes on gasoline and diesel fuel by 2 cents a gallon each July into 2022.

Proponents of an initiative to repeal gas tax increases in California plan to sue over the state-drafted title and summary for the ballot measure, which they say is misleading and negative.

U.S. crude producers are still set to pump record amounts of the commodity next year, but less so than previously projected, according to the latest government estimates.