P.A.M. Transportation Services Inc. reported higher net income and a dip in revenue in the second quarter amid improved operating ratios in its divisions.

The U.S. average retail price of diesel dropped 1.7 cents to $2.994 a gallon, the Department of Energy reported Aug. 19. Crude oil prices lifted moderately to pass $56 a barrel as U.S.-China trade tensions eased somewhat, while a drone attack on an oil field in Saudi Arabia rekindled concerns over the oil supply chain.

UPS Inc. announced its venture capital arm, UPS Ventures, has made a minority investment in autonomous driving company TuSimple to test self-driving tractor-trailers on a route in Arizona to determine whether the vehicles can improve service and efficiency in the UPS network.

Independent engine maker Cummins Inc. supplied a leading 35.8% of the diesel engines used in the first half of 2019, amid an expanding market, WardsAuto.com reported, based on data that differed from the prior year.

U.S. Class 8 retail sales in July topped 25,000, the highest volume this year, and extended a string of year-over-year gains that began two years earlier, WardsAuto.com reported.

It’s been a tough year for trailer orders, and July was no exception as preliminary net orders fell below 10,000 units.

U.S. retail sales of medium-duty trucks in July rose 14% and cleared 22,000 units, WardsAuto.com reported.

Less-than-truckload carrier Old Dominion Freight Line reported higher net income and revenue in the second quarter as it achieved, amid lower shipments and tonnage, company records for revenue, operating ratio and earnings per diluted share.

Truck dealership Rush Enterprises reported higher net income and revenue on strong aftermarket activity and new truck sales, especially medium-duty.

Daimler AG outlined a series of moves to return to profitability after posting a net loss in the second quarter, particularly at its largest division, Mercedes-Benz cars.