Plug-in vehicles, which include all-electric and plug-in hybrid electric vehicles, have been saving increasing amounts of gasoline.
When gasoline consumption of conventional internal combustion engine vehicles is compared with similar sized plug-in vehicles operating on electricity, plug-in vehicles on the road displaced 216 million gallons of gasoline in 2017.
Gasoline displacement from plug-in vehicles is about 39% more than it was in 2016 and about twice as much as 2015. The gasoline displacement from all-electric versus plug-in hybrid vehicles was split almost evenly in 2012 and 2013 but battery-electric vehicles accounted for 60% of the gasoline displacement by 2017.
Note: Includes only light vehicles.[source: US DOE]