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and EPA Tier 2 standards) propulsion systems based on fuel cells and 4-stroke direct-injection engines.
3. Based on its own knowledge of worldwide developments of the technologies under development in the PNGV program, comment on whether PNGV is pursuing appropriate directions to overcome technical barriers. If, in the opinion of the committee, PNGV should be pursuing other approaches based on work ongoing outside of PNGV, the committee will recommend suitable approaches to be taken.
The conclusions and recommendations in this report are based on the committee's meetings, presentations, and other data-gathering activities (see
Appendix C). USCAR presented some material as proprietary information under an agreement signed by the National Academy of Sciences, USCAR, and the U.S. Department of Commerce (on behalf of the federal government).