The FedEx Corporation announced today that it planned to replace 30,000 of its delivery trucks with energy-saving, environmentally friendly hybrid-powered vehicles.

The company said that it had already purchased 20 such trucks to begin building what would be one of the first big commercial fleets of hybrid vehicles. The new trucks — powered by both diesel engines and electric motors in a mix controlled by onboard computers — will be introduced over the next several months in four American cities.

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