| 21CTP | 21st Century Truck Partnership |
| A | ampere |
| AAR | Association of American Railroads |
| ABI | Allied Business Intelligence Research |
| ABS | anti-lock braking system |
| AC | alternating current |
| ACC | American Control Conference |
| ACEA | European Automobile Manufacturers Association |
| ACEEE | American Council for an Energy-Efficient Economy |
| ACT | America’s Commercial Transportation Research Company |
| AEO | Annual Energy Outlook |
| AFDC | Alternative Fuels Data Center |
| Ah | amp-hours |
| ANL | Argonne National Laboratory |
| ARPA-e | Advanced Research Projects Agency–Energy |
| ASIWPCA | Association of State and Interstate Water Pollution Control Administrators |
| ASME | American Society of Mechanical Engineering |
| AT | automatic transmission |
| ATA | American Trucking Associations |
| ATI | automatic tire inflation |
| ATIS | automatic tire inflation systems |
| ATRI | American Transportation Research Institute |
| BAU | business-as-usual |
| BEV | battery electric vehicle |
| BMP | best management plan |
| BSG | belt-starter-generator |
| BTE | brake thermal efficiency |
| BTL | biomass-to-liquid |
| CAA | Clean Air Act |
| CACC | cooperative adaptive cruise control |
| CAD | computer-aided design |
| CAFE | corporate average fuel economy |
| CalHEAT | California Hybrid, Efficient and Advanced Truck Research Center |
| CARB | California Air Resources Board |
| Cdwa | wind-averaged drag coefficient |
| CFD | computational fluid dynamics |
| CGVW | combined gross vehicle weight |
| CH4 | methane |
| CI | compression-ignition |
| CILCC | Combined International Local and Commuter Cycle |
| C-ITS | cooperative intelligent transportation systems |
| CLEERS | crosscut lean exhaust emissions reduction simulations |
| CMU | Carnegie Mellon University |
| CN | cetane number |
| CNG | compressed natural gas |
| CO | carbon monoxide |
| CO2 | carbon dioxide |
| CRC | Coordinating Research Council |
| Crr | rolling resistance coefficient |
| CVT | continuously variable transmission |
| CWA | Clean Water Act |
| DBE | double carbon bond equivalent |
| DC | direct current |
| DDFS | direct dual-fuel stratification |
| DDPP | Deep Decarbonization Pathways Project |
| DEF | diesel exhaust fuel |
| DICE | Dynamic Integrated Climate-Economy Model |
| DME | dimethyl ether |
| DOC | diesel oxidation catalyst |
| DOE | Department of Energy |
| DOT | Department of Transportation |
| DPF | diesel particulate filter |
| EAA | European Aluminum Association |
| EC | European Commission |
| EDF | Environmental Defense Fund |
| EDI | Efficient Powertrains, Inc. |
| EDT | electric drive technologies |
| EERE | Office of Energy Efficiency and Renewable Energy |
| EESTT | Electrochemical Energy Storage Technical Team |
| EGR | exhaust-gas recirculation |
| EIA | Energy Information Administration |
| EISA | Energy Independence and Security Act |
| EPA | Environmental Protection Agency |
| EPCA | Energy Policy and Conservation Act |
| EPS | electronic power steering |
| ET | Economic Times Auto |
| EU | European Union |
| FACE | Fuels for Advanced Combustion Engines |
| FAME | fatty acid methyl esters |
| FC | fuel cell |
| FCEV | fuel cell electric vehicle |
| FE | fuel efficiency |
| FHEV | full hybrid electric vehicle |
| FHWA | Federal Highway Administration |
| FMCSA | Federal Motor Carrier Safety Administration |
| FMEP | friction mean effective pressure |
| FTP | Federal Test Procedure |
| FUDS | Federal Urban Driving Schedule |
| GAO | Government Accountability Office |
| GCM | Global Climate Model |
| GDCI | gasoline direct-injection compression ignition |
| GDI | gasoline direct fuel injection |
| GDP | gross domestic product |
| GEM | Greenhouse Gas Emissions Model |
| GHG | greenhouse gas |
| GPS | Global Positioning Systems |
| GVW | gross vehicle weight |
| GVWR | gross vehicle weight rating |
| GWP | global warming potential |
| H2O | water |
| HC | hydrocarbon |
| HCCI | homogenous charge compression ignition |
| HDRD | hydrogenation-derived renewable diesel |
| HEV | hybrid-electric vehicle |
| HHD | heavy heavy duty |
| HHV | hydraulic hybrid powertrain vehicle |
| hp | horsepower |
| HPDI | high-pressure direct injection |
| HVAC | heating, ventilation, and air conditioning |
| IAM | Integrated Assessment Model |
| IC | indirect cost |
| ICCT | International Council on Clean Transportation |
| ICE | internal combustion engine |
| ICM | indirect cost multiplier |
| IEA | International Energy Agency |
| IMA | integrated motor assist |
| i-MMD | intelligent multi-mode drive |
| IPCC | Intergovernmental Panel on Climate Change |
| ISG | integrated starter/generator |
| ISO | International Organization for Standardization |
| ITS | intelligent transportation system |
| IWG | Interagency Working Group |
| kg | kilogram |
| kg/t | kilograms per ton |
| kW | kilowatt |
| kWh | kilowatt-hour |
| L | liter |
| LCA | life-cycle assessment |
| LCD | liquid-crystal display |
| LCFS | low-carbon fuel standard |
| LCO | lithium cobalt oxide |
| LCV | longer combination vehicles |
| LDV | light-duty vehicle |
| LFP | lithium iron phosphate |
| LHD | light heavy duty |
| Li-ion | lithium-ion |
| LiNiMnCoO2 | lithium-nickel-manganese-cobalt-oxide |
| LMO | lithium manganese oxide |
| LNG | liquefied natural gas |
| LRR | low rolling resistance |
| LSFC | load-specific fuel consumption |
| LTC | low-temperature control |
| LTO | lithium titanate oxide |
| m2 | meters squared |
| m2/g | meters squared per gram |
| mAh/g | charge per gram |
| MBRC | miles between road calls |
| MECA | Manufacturers of Emission Controls Association |
| MH | mild hybrid |
| MHD | medium heavy duty |
| MHDV | medium- and heavy-duty vehicle |
| mi | miles |
| MJ | megajoule |
| MMTCO2e | metric tons of carbon dioxide equivalent |
| mpg | miles per gallon |
| mph | miles per hour |
| MRD | multi-ring domed |
| MY | model year |
| NACFE | North American Council for Freight Efficiency |
| NAE | National Academy of Engineering |
| NAFTA | North American Free Trade Agreement |
| NAMII | National Additive Manufacturing Innovation Institute |
| NAS | National Academy of Sciences |
| NASA | National Aeronautics and Space Administration |
| NASEM | National Academies of Sciences, Engineering, and Medicine |
| NCA | nickel-cobalt-aluminum-oxide |
| NCM | nickel-cobalt-manganese |
| NEMS | National Energy Modeling System |
| NESCCAF | Northeast States Center for a Clean Air Future |
| NG | natural gas |
| NGV | natural gas vehicle |
| NGWBS | next-generation wide-based single |
| NHTSA | National Highway Traffic Safety Administration |
| Ni-Cd | nickel-cadmium |
| NiMH | nickel-metal hydride |
| Nm | Newton-meter |
| NNI | National Nanotechnology Initiative |
| NNMI | National Network for Manufacturing Innovation |
| NO | nitric oxide |
| NO2 | nitrogen dioxide |
| NOx | nitrous oxides |
| NPC | National Petroleum Council |
| NPRM | notice of proposed rulemaking |
| NRC | National Research Council |
| NREL | National Renewable Energy Laboratory |
| NTEA | Association for the Work Truck Industry |
| OBD | on-board diagnostics |
| OECD | Organisation for Economic Co-operation and Development |
| OEM | original equipment manufacturer |
| OPEC | Organization of the Petroleum Exporting Countries |
| ORC | organic Rankine cycle |
| ORNL | Oak Ridge National Laboratory |
| OTAQ | Office of Transportation and Air Quality |
| P | power |
| PCCI | premixed charge compression-ignition |
| PEM | polymer exchange membrane |
| Peng | engine power demand |
| PFI | port fuel injection |
| PGM | platinum group metal |
| PHEV | plug-in hybrid electric vehicle |
| PM | particulate matter |
| PM2.5 | fine particulate matter |
| PMI | particulate matter index |
| PPC | partially premixed combustion |
| PS | power split |
| psi | pounds per square inch |
| PSI | Power Solutions International |
| PTO | power-take-off |
| R&D | research and development |
| RCCI | reactivity controlled compression ignition |
| RFS | Renewable Fuel Standard |
| RFS2 | Renewable Fuel Standard Program (2) |
| RGGI | Regional Greenhouse Gas Initiative |
| RIA | Regulatory Impact Analysis |
| RIN | Renewable Identification Number |
| ROI | return-on-investment |
| RON | research octane number |
| RPE | retail price equivalent |
| RPM | revolutions per minute |
| RSW | resistance spot welding |
| SAE | Society of Automotive Engineers |
| SCAQMD | South Coast Air Quality Management District |
| SCC | social cost of carbon |
| SCR | selective catalytic reduction |
| SES | Stored Energy Solutions |
| SI | spark-ignition |
| SLM | selective laser melting |
| SOC | state of charge |
| SOT | statement of task |
| SOx | sulfur oxides |
| SS | stop-start |
| ST | SuperTruck |
| STAA | Surface Transportation Assistance Act |
| SwRI | Southwest Research Institute |
| TARDEC | Tank Automotive Research Development and Engineering Center |
| TMC | Technology and Maintenance Council |
| TP | tractive power |
| TPMS | tire pressure monitoring system |
| TTW | tank to wheel |
| TWC | three-way catalyst |
| UPS | United Parcel Service of America |
| USABC | United States Automotive Battery Consortium |
| U.S. DRIVE | United States Driving Research and Innovation for Vehicle Efficiency and Energy Sustainability |
| V | volt |
| V2P | vehicle-to-pedestrian |
| V2V | vehicle-to-vehicle |
| VANET | Vehicular Ad-Hoc Network |
| VIUS | Vehicle Inventory and Use Survey |
| VMT | vehicle miles traveled |
| VOC | volatile organic compound |
| VPD | vehicle power demand |
| VVA | variable valve actuation |
| VVT | variable valve timing |
| W/kg | watts per kilogram |
| WBG | wide band gap |
| WBST | wide-base single tire |
| Wh/kg | watt-hours per kilogram |
| Wh/l | watt-hours per liter |
| WHR | waste-heat recovery |
| WQA | Water Quality Act |
| WTT | well-to-tank |
| WTW | well-to-wheels |
| WVU | West Virginia University |