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The average national price of retail diesel fuel continued its climb, gaining 3.4 cents from last week to $2.98 a gallon, the Energy Department reported Monday.

The U.S. Postal Service and FedEx Corp. unit FedEx Express said Tuesday they have agreed to a new contract for domestic air transportation of postal express shipments, to run through September 2013.

Refrigerated truckload carrier Frozen Food Express Industries reported Tuesday its second-quarter income fell to $2.1 million or 11 cents a share, from $5.8 million or 31 cents a year ago.

The Institute for Supply Management’s manufacturing index gained in July, the group said Tuesday.

Construction spending rose 0.3% in June, the Commerce Department said Tuesday.

Consumer personal spending rose 0.4% in June, the smallest gain this year, the Commerce Department said Tuesday.

Specialty truck maker Oshkosh Truck Corp. said Tuesday it earned $53.4 million or 72 cents a share for its third fiscal quarter ended June 30, up from $38.7 million or 52 cents a year ago.

Air cargo shipments rose 6.2% in June compared with the same month last year, the Air Transport Association said Tuesday.

Logistics firm Expeditors International of Washington Tuesday reported a second-quarter profit of $56.3 million or 25 cents a share, up up more than 50% from $36.7 million or 17 cents a year ago.

The nation’s largest for-hire carriers entered uncharted territory this year as growing demand and tight capacity continue to fuel a financial revival, and trucking executives try to adapt to fundamental changes in the flow of freight and a growing labor crisis.