NREL study finds 2nd-generation diesel hybrid delivery vans show significant gains in fuel economy over conventional vans
Green Car Congress
SEPTEMBER 29, 2012
The two study groups were on different duty cycles and required a route switch to provide a valid comparison, which UPS accommodated. The hybrid group accumulated 33% fewer miles than the conventional group during the complete 18-month study. The NREL team evaluated fuel economy during equal 5-month periods from different years.
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