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NREL - National Renewable Energy Laboratory
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NREL's Fleet Test and Evaluation Team publishes technical reports, fact sheets, and other documents about the performance evaluations it conducts. Visit the following links to find publications about hybrid electric drive systems and alternative fuels in medium- and heavy-duty trucks:

Refer to the Fleet DNA fact sheet or Fleet DNA webpage to learn about this clearinghouse of medium- and heavy-duty commercial fleet transportation data, which can be used for optimizing vehicle designs or selecting technologies for deployment. Refer to the Using Data-Focused Tools to Assess Lower Vehicle Energy Use presentation for information about using refined transportation data to make informed decisions.

For other fleet test and evaluation documents, search the NREL Publications Database or the Alternative Fuels Data Center.