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Finding 6-17. Some fuel-efficiency-improving technologies will reduce cargo capacity for trucks that are currently “weighed out” and will therefore force additional trucks onto the road. More research is needed to assess the significance of this potential impact.

Finding 6-18. The committee found no current studies or analyses suggesting that manufacturability was a major barrier to the integration of gas/diesel engine, hybrid, aerodynamic, tire, or other technologies in the vehicle manufacturing process. However, there may be challenges with integrating new technologies into manufacturers’ product development processes, and sufficient time is needed for design and validation, customer acceptance, testing, and compliance strategy development.

Recommendation 6-1. The National Highway Traffic Safety Administration, in its study, should do an economic/payback analysis based on fuel usage by application and different fuel price scenarios. Operating and maintenance costs should be part of any study.

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