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PRINCETON, N.J. — ALK Technologies will add a Web-based version of its PC Miler mapping and routing software to the company’s family of truck navigation products this year, ALK’s chief technology officer said.

U.S. retail fuel prices continued to soar into uncharted territory last week, as the average price of diesel jumped another 8.4 cents to $4.143 a gallon and gasoline gained 11.9 cents to $3.508, the Department of Energy reported.

An unprecedented wave of exports, mostly to Russia, has cushioned a downturn in the Class 8 used-truck business, which has been hurt by high fuel prices and a weak freight market, according to industry executives.

Truckload carriers are slashing capacity at the highest rate in a decade in an effort to bring supply and demand into balance as fuel prices skyrocket and demand withers, according to industry experts.

New home sales fell to a 17-year low in March, the Commerce Department said Thursday.

Durable goods orders fell 0.3% in March, though bookings excluding transportation orders increased, the Commerce Department said Thursday.

Canada Post Corp. and FedEx Express Canada have developed a new priority worldwide international express service, the two said Wednesday.

Eastern freight railroad Norfolk Southern Corp. said its first-quarter profit rose 2%, as higher revenue per shipment offset an overall drop in traffic and record fuel prices.

Crude oil prices fell for the first time in four days Wednesday, a day after setting a closing-price record of more than $119 a barrel, Bloomberg reported.