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Greenhouse Gas Reductions Driven by Vehicle Electrification across Powertrains, Classes, Locations, and Use Patterns
Elizabeth Smith1,2, Maxwell Woody2,3, Timothy J Wallington1,2
1Electric Vehicle Center, University of Michigan, Ann Arbor, Michigan 48109, United States.
Environmental Science & Technology
|August 25, 2025
Summary
Electric vehicles (EVs) demonstrate lower greenhouse gas (GHG) emissions than gasoline cars nationwide, even when accounting for driving patterns and cargo. This study confirms EVs are the greener choice across all US counties.
Area of Science:
- Environmental Science
- Automotive Engineering
- Climate Change Mitigation
Background:
- Growing concerns about transportation's contribution to greenhouse gas (GHG) emissions.
- Increasing adoption of diverse light-duty vehicle (LDV) powertrains, including electric, hybrid, and internal combustion engines.
- Need for location-specific and use-case-specific emissions data for informed decision-making.
Purpose of the Study:
- To comprehensively assess cradle-to-grave GHG emissions for 2025 LDVs.
- To compare emissions across various powertrains (BEV, PHEV, HEV, ICEV), vehicle classes, and geographic locations in the US.
- To evaluate the impact of different driving patterns, including cargo hauling, on vehicle emissions.
Main Methods:
- Development of driver archetypes and simulation of diverse use patterns (drive cycles, utility factors, cargo loads).
- Application of an attributional approach to characterize GHG emissions for different LDV scenarios.
- Geospatial analysis of emissions across all counties in the contiguous United States.
Main Results:
- Battery electric vehicles (BEVs) exhibit lower GHG emissions than gasoline vehicles in every US county, driven by grid decarbonization and EV efficiency.
- A 300-mile range BEV shows significantly lower emissions compared to plug-in hybrid (PHEV), hybrid (HEV), and internal combustion engine vehicles (ICEVs).
- Vehicle downsizing reduces emissions (e.g., compact ICEV vs. ICEV pickup), and carrying cargo impacts BEV and ICEV emissions differently, with ICEVs experiencing a larger percentage increase.
Conclusions:
- Electric vehicles represent a consistently lower-emission option across the contiguous US, regardless of location.
- Vehicle class, powertrain, and usage patterns (including cargo) are critical factors influencing total GHG emissions.
- Findings provide crucial data for consumers, manufacturers, and policymakers to guide sustainable transportation choices.
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