United States Department of Transportation
i
Transportation revenue impacts from a changing light-duty vehicle fleet.
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2013-09-01
[PDF-2.01 MB]
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Abstract:Advanced fuel economies in both traditional internal combustion engine vehicles (ICEs) and
electric vehicles (EVs) have a strong influence on transportation revenue by reducing fuel
consumption per vehicle and ultimately drawing down the amount of fuel tax revenue received. It is
expected that more ICE vehicles with advanced fuel economies and EVs, especially gasoline hybrid
EVs, will enter the roadway in coming years, and fuel tax revenues and the Highway Trust Fund will
increasingly become more affected. This study estimates the impact that increased sales of advanced
ICEs and EVs will have on future fuel tax revenues by drawing on industry estimates of future EV
and ICE market shares and anticipates future fleet mix and fuel economy for both vehicle
technologies. An estimation process overview is provided and assumptions are described.
Fuel tax revenue amounts that would be expected from future light vehicle fleets with
increased shares of EVs are compared to equivalently sized fleets composed of all ICEs, and future
fleet mixes are estimated. Results show that as more EVs enter the light vehicle fleet, greater
revenue losses are expected, and total losses from years 2011 through 2050 depend on fleet
composition and fuel economy of both vehicle types. It is found that the amount of fuel taxes paid by
ICE drivers each year remain greater than fuel taxes paid by EV drivers even with advances in the
average ICE vehicle fuel economy. Finally, a review of alternative revenue generation methods that
states are employing to cover fuel tax revenue gaps is given.
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