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.