A report released this morning by the National Research Council (NRC) calls for the federal Phase II Rule on fuel consumption and greenhouse-gas (GHG) emissions to include: A separate GHG/MPG standard for natural-gas vehicles A natural-gas fuel spec for motor vehicle use GHG/MPG “performance standards” for new, 53-ft and longer van and reefer trailers The report also recommends considering the inclusion on a low-rolling-resistance standard for new tractor-trailer ...

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