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Wal-Mart Stores Inc.’s vow to double sales of locally grown produce by 2015 should win favor with U.S. consumers but won’t have much effect on the world’s largest retailer’s supply chain, experts said.

A series of proposed amendments to California’s emissions-reduction regulations for heavy trucks would save the trucking industry more than $3 billion, in part by delaying some compliance requirements, according to a new report by the state’s environmental regulatory staff.

LEHIGH VALLEY, Pa. — Mack Trucks’ leadership rallied the company’s sales force here, urging dealers to sell more Pinnacle highway tractors in addition to the traditional vocational offerings. The formula for success, the leaders said, would be new ClearTech SCR engines, M-Drive transmissions and a “Made in the USA” appeal to economic patriotism.

HUNTSVILLE, Ala. — Navistar Inc. opened its new heavy-duty engine plant to journalists last week, showing where 114 employees are currently churning out 125 13-liter MaxxForce power plants a day.

The U.S. retail diesel average remained at $3.067 a gallon last week, leaving the price virtually unchanged for three weeks, the Department of Energy reported.

North American truck tire manufacturers have imposed a new round of price increases, generally about 8%, citing higher raw material costs that coincided with greater tire sales and some reports of tire shortages.

The electoral wave that handed control of the House of Representatives to the Republicans also roiled the body’s transportation committee, ousting the panel’s current chairman and putting Rep. John Mica (R-Fla.) in position to lead the key committee.

Roadrunner Transportation Systems, which went public in May, said its net income rose to $4.4 million, or 14 cents per share, compared with $100,000, or 1 cent, a year ago.

The U.S. unemployment rate was unchanged at 9.6% in October, while the number of jobs grew at the highest pace in five months and trucking jobs taking a slight upturn, the Labor Department said Friday.