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NREL - National Renewable Energy Laboratory
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Alternative Fuels

NREL's Fleet Test and Evaluation Team works with industry partners to evaluate the use of alternative fuels in delivery, transit, and freight vehicles. Although biodiesel is the most commonly used alternative fuel in medium- and heavy-duty diesel vehicles, compressed and liquefied natural gas and Fischer-Tropsch diesel are also viable options for trucking companies.

Learn more about the team's evaluations of alternative fuels in fleet operations: