Surface transportation trade among the United States, Canada and Mexico jumped 39.5% in May, the largest increase since records began, the Department of Transportation said Thursday.

Diesel’s national retail price will average $2.98 a gallon this year, the Department of Energy said in boosting its most recent prediction by 2 cents.

Daimler Trucks North America said it has reached new three-year collective bargaining agreements covering union workers at its truck plant in Portland, Ore.

DOT 133-10 Tuesday, July 6, 2010 Contact:

Diesel and gasoline both rose for the first time in six weeks, with diesel gaining 3.3 cents to $2.961 a gallon, the Department of Energy said.