Truck fuel statistics show a large, diesel-dependent U.S. freight system with sharply different fuel-use patterns by vehicle class, body type, payload and operating cycle. The figures below distinguish observed values, modeled estimates, historical tests and future targets.
Key Truck Fuel Statistics
The most broadly useful figures are:
- U.S. medium- and heavy-duty vehicle energy consumption increased 19% from 2000 to 2022, according to an inventory-aligned estimate for on-road MHDVs.
- U.S. MHDV greenhouse-gas emissions increased 20% from 2000 to 2022, an inventory-based outcome rather than a fuel-volume measure.
- Diesel powered 92% of U.S. MHDVs in the 2022/current fleet mix, while gasoline powered 7%.
- MHDVs moved 65% of U.S. freight by weight in 2022 in the United States.
- MHDVs accounted for 41% of U.S. freight ton-miles in 2022, compared with 29% for rail, 10% for marine transport and 20% for pipelines.
- MHDV ton-miles are projected to increase 68% between 2022 and 2050 in the Freight Analysis Framework projection.
- Long-haul freight was estimated at 107.9 billion vehicle-miles in 2022 for U.S. freight MHDVs.
- Long-haul trucks averaged 6.8 miles per gallon of diesel in the federal plan’s 2022 segment description for U.S. long-haul freight trucks.
- Full-size vans averaged 10.1 mpg in 2021, the highest listed medium/heavy truck body-type average in the DOE comparison.
- Concrete mixers averaged 4.0 mpg in 2021, the lowest listed truck-type average in that DOE comparison.
- Diesel Class 8B combination long-haul vans used 7.4 gallons per 1,000 ton-miles for model year 2013 in a U.S. modeled fleet average.
- Diesel Class 4 vocational trucks used 42.3 gallons per 1,000 ton-miles for model year 2013, using the Argonne productivity denominator.
- Diesel Class 8B trucks consumed 14,570 million gallons in 2002, or 64.8% of the historical diesel heavy-truck table total.
- Class 6 city fuel economy fell from 9.48 mpg at 8,000 lb to 7.15 mpg at 28,000 lb in an EPA/Navistar test.
- Five Class 8 trucks in a cited 2003 study showed idling fuel consumption from 0.5 to 1.8 gallons per hour, a small-sample trial range.
- Extended idling contributed 59% of modeled CO emissions for model-year 2010 long-haul Class 8B trucks, according to a MOVES-based estimate.
- The federal MHDV plan targets 30% zero-emission MHDV sales by 2030 in the United States.
- The federal MHDV plan targets 100% zero-emission MHDV sales by 2050, a policy ambition rather than measured adoption.
Contents
- Truck fuel consumption scale and diesel dependence
- Truck fuel economy by body type and operating segment
- Truck fuel use, mileage and payload productivity
- How weight and loading change truck fuel economy
- Truck idling fuel use and emissions
- Truck fuel trends and zero-emission transition
Truck Fuel Consumption Scale and Diesel Dependence
The federal report defines MHDVs generally as on-road commercial vehicles above 8,500 lb GVWR, while older EPA material uses heavy-duty trucks above 8,500 lb GVW. Those populations should not be merged without qualification.
In the federal plan’s current fleet mix, diesel accounted for 92% of U.S. MHDVs, gasoline for 7%, and natural gas or propane for about 1% in 2022. The diesel figure is a vehicle share, not a share of gallons consumed. EPA, A Report on Actions for Medium- and Heavy-Duty Vehicle Energy and Emissions Innovation
The same report estimated that U.S. MHDV energy consumption rose 19% from 2000 to 2022 and MHDV greenhouse-gas emissions rose 20%. These are national inventory-aligned estimates, and the emissions figure is an outcome measure rather than fuel volume. EPA, A Report on Actions for Medium- and Heavy-Duty Vehicle Energy and Emissions Innovation
Freight importance is also measured in several ways:
- MHDVs moved 65% of U.S. freight by weight and 63% by value in 2022.
- MHDVs accounted for 41% of U.S. freight ton-miles, compared with 29% for rail, 10% for marine transport and 20% for pipelines in 2022.
- MHDV ton-miles are projected to increase 68% between 2022 and 2050; this is a Freight Analysis Framework forecast, not an observed result.
EIA reported about 2.94 million barrels per day, or about 123 million gallons per day, of U.S. transportation-sector distillate consumption in 2025. Transportation represented about 75% of total U.S. distillate consumption, while diesel represented about 22% of U.S. transportation energy consumption on an energy-content basis; these figures include transportation uses beyond trucks and exclude biodiesel and renewable diesel. EIA, Use of diesel
Truck Fuel Economy by Body Type and Operating Segment
On-road fuel economy varies substantially by truck body type. The DOE’s 2021 comparison used averages from the Vehicle Inventory and Use Survey public-use file and excluded pickups, SUVs, light vans and trucks without a reported body type.
| Medium/heavy truck body type | Average fuel economy, 2021 | Geography and measure |
|---|---|---|
| Full-size vans | 10.1 mpg | United States VIUS average |
| Garbage trucks | 4.5 mpg | United States VIUS average |
| Concrete mixers | 4.0 mpg | United States VIUS average |
Full-size vans were highest among the listed body types, while concrete mixers were lowest. These are body-type averages, not standardized laboratory-cycle results. DOE, FOTW #1342
SmartWay’s 2013 reported Class 8A carrier-partner data showed fuel economy clustered overwhelmingly between 5 and 8 mpg. The partner sample covered all fuel types and was not a census of all Class 8A trucks. EPA, SmartWay TIPS: Trends, Indicators, and Partner Statistics
Argonne’s modeled MY 2013 fuel-consumption figures use different denominators by category. The following rows retain gallons per 1,000 ton-miles exactly as reported:
| Diesel truck category | Modeled fuel consumption, MY 2013 | Measure |
|---|---|---|
| Class 8B combination long-haul vans | 7.4 gal/1,000 ton-miles | U.S. modeled fleet average |
| Class 8B combination short-haul vans | 7.3 gal/1,000 ton-miles | U.S. modeled fleet average |
| Class 8B dump trucks | 6.6 gal/1,000 ton-miles | U.S. modeled fleet average |
| Class 8A refuse trucks | 19.8 gal/1,000 ton-miles | U.S. modeled fleet average |
| Class 6 vocational trucks | 26.0 gal/1,000 ton-miles | U.S. modeled fleet average |
| Class 4 vocational trucks | 42.3 gal/1,000 ton-miles | U.S. modeled fleet average |
Argonne separately reported 34 gallons per 100 miles for diesel Class 2B heavy-duty pickups and vans, 4.0 gallons per 100 miles for gasoline Class 6 vocational trucks and 1.2 gallons per 100 miles for gasoline Class 2B heavy-duty pickups and vans. Those gallons-per-100-miles rows are not directly comparable with the ton-mile rows. Argonne, MOVES2014a: Estimating Fuel Use and Emissions from Heavy-Duty Vehicles
Truck Fuel Use, Mileage and Payload Productivity
The historical Argonne fleet table illustrates how Class 8B dominated diesel heavy-truck activity in 2002. It reported 14,570 million gallons for Class 8B, equal to 64.8% of the table’s diesel heavy-truck total, and 82,198 million miles, equal to 58.6% of the table’s diesel HDV miles.
| Diesel class | Fuel consumed, 2002 | Share of table total | Miles traveled, 2002 | Share of table miles |
|---|---|---|---|---|
| Class 8B | 14,570 million gal | 64.8% | 82,198 million mi | 58.6% |
| Class 8A | 3,267 million gal | 14.5% | 18,999 million mi | 13.6% |
| Class 7 | 747 million gal | 3.3% | 5,032 million mi | 3.6% |
| Class 6 | 1,230 million gal | 5.5% | 9,401 million mi | 6.7% |
| Class 4 | 440 million gal | 2.0% | 4,237 million mi | 3.0% |
These 2002 fleet values, 2013 modeled consumption values and 2021 VIUS averages are not one continuous time series. They describe different studies, years and measurement frameworks. Argonne, MOVES2014a
The federal plan estimated 107.9 billion vehicle-miles for U.S. long-haul freight MHDVs in 2022, alongside 2,055.7 trillion Btu of energy use and 156.6 million metric tons of CO2e. Class 7/8 local and regional freight used 1,527.0 trillion Btu, while Class 4–6 local and regional freight used 379.0 trillion Btu in the same year. EPA, A Report on Actions for Medium- and Heavy-Duty Vehicle Energy and Emissions Innovation
How Weight and Loading Change Truck Fuel Economy
EPA/Navistar test data show that gross weight can materially change fuel economy, with the effect differing between city and highway operation. These are manufacturer test results for specific engines and trucks, not national fleet averages.
| Test vehicle and cycle | Light test weight | Heavy test weight | Fuel economy change |
|---|---|---|---|
| Class 6 city | 9.48 mpg at 8,000 lb | 7.15 mpg at 28,000 lb | Lower at higher weight |
| Class 6 highway | 9.50 mpg at 8,000 lb | 8.24 mpg at 28,000 lb | Lower at higher weight |
| Class 8A city | 9.41 mpg at 10,000 lb | 7.14 mpg at 30,000 lb | Lower at higher weight |
| Class 8A highway | 8.68 mpg at 10,000 lb | 7.41 mpg at 30,000 lb | Lower at higher weight |
The Class 6 truck recorded 7.63 mpg at 23,000 lb gross weight. EPA’s derived sensitivity coefficients were 0.307 city and 0.146 highway for Class 6, 0.369 city and 0.188 highway for Class 7/8A, and 0.523 city and 0.298 highway for Class 8B; these coefficients are not mpg values. EPA, Analysis of Heavy Duty Truck Fuel Efficiency to 2001
Truck Idling Fuel Use and Fuel-Related Emissions
Idling is a distinct fuel-use condition rather than a mileage-based fuel-economy result. In a small 2003 study cited by Argonne, five Class 8 trucks showed idling consumption from 0.5 to 1.8 gallons per hour; the range should not be treated as a fleet average.
For model-year 2010 long-haul Class 8B trucks, Argonne reported MOVES-based estimates that extended idling contributed 59% of modeled CO emissions, 55% of NOx emissions, 85% of CH4 emissions and 50% of VOC emissions. These allocations are model estimates, and extended-idling emissions were excluded from some base factors. Argonne, MOVES2014a
Truck Fuel Trends, Efficiency Improvements and Zero-Emission Transition
Historical projections provide context but are not current fleet averages. EPA’s 1991 analysis projected a 22% net fuel-economy improvement for Class 8B trucks from 1987 to 2001 without an NOx-standard penalty, or a 17.5% net improvement if the penalty reached 3% to 5%.
The same report estimated that accessory loads used 7% to 10% of total engine power output. It projected conventional lubricant improvements would deliver a 1% city fuel-economy gain and a 0.5% highway gain by 2001. EPA, Analysis of Heavy Duty Truck Fuel Efficiency to 2001
The federal MHDV plan’s transition targets are expressed as sales shares, not measured adoption rates. It targets 30% zero-emission MHDV sales by 2030 and 100% by 2050 in the United States. EPA, A Report on Actions for Medium- and Heavy-Duty Vehicle Energy and Emissions Innovation
A major segment for that transition is local and regional return-to-base operation. The federal plan estimated 7.2 million such vehicles in 2022, equal to 50% of commercial MHDVs; the segment represented 44% of MHDV vehicle-miles traveled and 45% of MHDV energy consumption. EPA, A Report on Actions for Medium- and Heavy-Duty Vehicle Energy and Emissions Innovation