Wal-Mart Stores Inc said on Monday that it will test two new types of hybrid trucks and two types of trucks powered by alternative fuels as the world’s largest retailer tries to make its trucking fleet more efficient.

Wal-Mart said it is working with suppliers, including ArvinMeritor and Peterbilt, to develop and test the new technologies.

Wal-Mart has one of the largest private trucking fleets in the world, and vowed in 2005 to make its trucking fleet 25 percent more efficient by the end of 2008. It said the latest tests are an effort to double its fleet efficiency by 2015, from its 2005 baseline.
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