The U.S. Postal Service plans to further increase the number of electric-powered vehicles it is buying to replace its aging fleet of delivery trucks. The Postal Service anticipates boosting electric vehicles from 20% to 50% of its initial purchase of 50,000 vehicles in a new environmental filing. It also proposes buying more than 34,000 commercially available vehicles over two years.

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The proposed changes are to be posted in the Federal Register on Thursday. They follow lawsuits by 16 states seeking to halt purchases under the initial proposal that called for a greater number of gas-powered trucks.

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