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The national average diesel price remained unchanged at $4.692 a gallon last week, following small declines for the previous two weeks, the Department of Energy reported, matching the longest stretch without an increase so far this year.

The national average price of diesel fuel was unchanged Monday from a week ago, holding at $4.692 a gallon, the Department of Energy said.

Canadian transportation firm Mullen Group Income Fund said Thursday it would buy the transport unit of Essential Energy Services Trust for C$135 million.

Diesel continued to soar last week, jumping 22.6 cents to put the national average retail price at an unprecedented $4.723 a gallon, according to the Department of Energy.

UPS Inc. said Wednesday it is moving its primary intra-Asia air hub to southern China, from the Philippines, to save money and reduce transit times across Asia.

Retail fuel prices skyrocketed again last week, with diesel jumping 18.2 cents a gallon to a national average of $4.331, the biggest one-week increase since October 2005 and more than 15 cents more than the last record.

American Trucking Associations launched a major initiative to meet the industry’s growing fuel-price crisis, supporting for the first time national truck fuel-economy standards.

An American Trucking Associations official asked a congressional panel to set a national speed limit of 65 miles per hour, as part of a series of steps ATA said would support the trucking industry’s efforts to reduce fuel consumption and address the escalating cost of diesel.