Study finds that increased vehicle travel and decreased occupancy have undercut the impact of improving fuel economy over last 40 years
Green Car Congress
MARCH 6, 2013
Because changes in fuel economy take a long time to percolate through the entire fleet, an 18% reduction in fuel used by vehicles purchased in a given year (due to a 20% improvement in their fuel economy) would result in only about a 1% reduction of the fuel used by the entire fleet.
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