As truck stops become more consolidated into a few large national networks, tire manufacturers are finding that they can provide fleets with a full range of tire services — not simply emergency repairs and replacements — while trucks are on the road.

The U.S. national average retail diesel fuel price fell 5.6 cents a gallon last week to $3.27, while gasoline dipped 5.1 cents to $3.017, the Department of Energy said.

Existing homes sales fell 2.2% in December, capping the biggest annual slump since 1982, the National Association of Realtors said Thursday.

Canadian National Railway Co. said its fourth-quarter net income rose C$833 million or C$1.68 per share, from C$499 million or 95 cents per share a year earlier.

Eastern freight rail line Norfolk Southern Corp.’s fourth-quarter profit rose 3.6% and the railroad increased its dividend, the company said late Tuesday.

Canadian Logistics software provider Descartes Systems Group said it has acquired Fluensee Inc.’s MobiTrac fleet management business.