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FedEx is announcing today that it has converted 92 of its trucks to diesel-electric hybrids (using lithium-ion batteries), bringing the total number of hybrids the company has to 264. There are a few reasons why these conversions are noteworthy. First, despite a bigger and more powerful engine (going from a 5.9L 175 HP diesel engine to a 6.7L 200 HP one), the converted trucks show an improvement of 44% in fuel economy, a decrease in particulate matter (PM) emissions of 96% (!), and a reduction of NOx emissions by 75%

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