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The Department of Energy has awarded a group of partners representing three universities, Oak Ridge National Laboratory and the city of Chattanooga, Tenn., a grant to research traffic control system optimization with an aim to reduce emissions.

WASHINGTON — President Donald Trump says he is nominating a deputy to Energy Secretary Rick Perry to replace him in the top job at the Energy Department.

The U.S. average retail price for diesel jumped 2.3 cents to $2.996 cents a gallon, the U.S. Department of Energy reported, while crude hovered near $62 a barrel amid political tensions in Iran and a decline in active U.S. oil wells.

The U.S. average retail price of diesel slipped 0.9 cent to $2.901 a gallon. The cost of trucking's main fuel dropped in all regions, except New England (up 2.4 cents) and the Central Atlantic (unchanged).

The U.S. average retail price of diesel slipped 1.2 cents to $2.910 a gallon as oil prices closed in on $58 a barrel — but then forecasts for U.S. oil production pointed to record volumes next year, causing oil prices to ease some.

The U.S. average retail price of diesel jumped 6.3 cents to $2.882 a gallon as oil climbed to its highest price since June 2015.

The U.S. average retail price of diesel vaulted 15.3 cents to $2.758 a gallon — its largest jump in 6½ years — as demand spiked while refineries in the Houston area reported difficulty restarting operations after the stubborn flood left by Hurricane Harvey.

The U.S. average retail price of diesel rose 1.7 cents to $2.598 in the seventh consecutive weekly rise for trucking's main fuel.

The U.S. average retail price of diesel jumped 5 cents to $2.581 in the sixth consecutive increase for trucking's main fuel.

The U.S. average retail price of diesel climbed 2.4 cents to $2.531 as the cost of crude broke past $50 a barrel.