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The nationwide average price of diesel fuel increased by one penny to $3.268 a gallon, the Department of Energy reported Sept. 17.

The U.S. average retail price of diesel inched up 0.6 cent to $3.258 a gallon, while crude oil prices fell amid questions over supplies in light of looming sanctions against Iran.

The national average retail price of diesel fuel increased by 2.6 cents, pushing the weekly average to $3.252 a gallon, according to the U.S. Energy Department’s weekly report released Sept. 4. Trucking’s main fuel now costs 49.4 cents a gallon more than it did a year ago, when it was $2.758 a gallon.

The U.S. average retail price of diesel inched down 0.3 cent to $3.223 a gallon, while crude oil prices were lower despite ongoing tensions over trade and the Middle East.

The U.S. average retail price of diesel crept up 0.6 cent to $3.226 a gallon while crude oil prices jumped higher as Middle East tensions continued.

The U.S. average retail price of diesel rose 0.9 cent to $2.605 a gallon as Hurricane Harvey wound down to a tropical storm after it disrupted oil production platforms and fuel refineries along the Gulf Coast of Texas before inundating Houston.