Diesel Hybrid MDHD
Medium- and heavy-duty diesel Hybrid Electric Vehicles use both an internal combustion engine that uses diesel and an electric motor. Electrical energy for the motor is stored in batteries, charged from regenerative braking. These vehicles have higher fuel economy and low tailpipe emissions, and they have power and ranges comparable to those of conventional vehicles (DOE, 2024); (Islam et al., 2023). The amount of fuel economy improvement for hybrid electric vehicles in particular depends on the assumed drive cycle and driving conditions and the associated available energy from regenerative braking.
On this page, explore key cost and performance metrics for diesel hybrid electric vehicles, including modeled vehicle price, fuel economy, levelized cost of driving (LCOD), and emissions. Compare powertrains and review caveats on the MDHD Comparison page.
Vehicle Metrics: Fuel Economy and Modeled Vehicle Price
The following chart shows fuel economy and modeled vehicle price, metrics associated with the vehicle. Fuel economy represents how efficiently a vehicle converts fuel during operation. Modeled vehicle price represents an estimated cost to the consumer to purchase a new vehicle, based on modeling that includes manufacturing costs and profit.
The source of the 2024 Transportation Annual Technology Baseline (ATB) modeled vehicle price and fuel economy is the Argonne National Laboratory (ANL) report (Islam et al., 2023); the original data are available here. These data are developed using ANL's Autonomie simulation tool.
Select the data to display using the menus above the chart. Use the Metric filter to switch between fuel economy and modeled vehicle price data. Select the vehicle class, powertrain, and other powertrain details using the additional filters.
Vehicle and Fuel Metrics: Levelized Cost of Driving and CO2e Emissions
The following chart shows levelized cost of driving and CO2e emissions in addition to the associated fuel data. Levelized cost of driving is a metric that combines modeled vehicle price, fuel economy, fuel cost, and other assumptions for the selected fuel. CO2e emissions represents the emissions for the fuel well-to-wheels portion of the life cycle for the selected fuel. Emissions associated with vehicle life cycles are not included here.
These calculations use data from Argonne National Laboratory, which develops and applies the Autonomie simulation tool and R&D GREET model (Wang et al., 2023). Links to data from the ANL report (Islam et al., 2023) on modeled vehicle price and fuel economy are available here.
Select the data to display using the buttons and menus above the chart. Use the Metric filter to switch between LCOD and CO2e emissions data. Select the pathway, scenario, vehicle class, and powertrain details using the additional filters. Clicking the black arrows on the top right of the figure shows additional details of the selected fuel pathways. The underlying source for a data point in the chart can be seen by placing your mouse cursor over that data point. The data sources are also cited—with linked references—in the Key Assumptions section next.
Notes:
- The levelized cost of driving in the ATB includes vehicle, fuel, and maintenance costs. See the levelized cost of driving definition for details of what is included in and excluded from LCOD in the ATB.
- Changes over time are attributable only to projected vehicle cost and performance; the fuel cost and emissions are constant over time.
- The Fuel Pathway filter displays the selected fuel pathways for the Baseline Fuel, Lowest Cost Fuel, and Lowest CO2e Emissions Fuel. The full set of fuel pathways is available in the data download.
- Emissions references and fuels costs and prices references do not always use the same data source for a given pathway. We recommend caution in interpretation of combined sources of information.
Key Assumptions
The data and estimates presented here are based on the following key assumptions:
- Fuel Economy Improvements: The assumptions about fuel economy improvements reflect the adoption of lightweighting and engine efficiency technologies consistently across vehicle powertrains for a given trajectory; they do not account for the trade-offs between efficiency and performance in various vehicle markets.
- Cost and Fuel Economy Trajectories: The cost and fuel economy trajectories are based on the analysis year Autonomie modeling results from Islam et al. (Islam et al., 2023). The ATB Advanced trajectory corresponds to the Base performance, High technology progress case. The ATB Mid trajectory corresponds to the Base performance, Low technology progress case. The ATB Conservative trajectory is based on the Annual Energy Outlook (EIA, 2023). The ATB Constant trajectory is set to the 2022 values in the Low technology progress, High-cost case and held constant through 2050. The Constant trajectory is used only where the Conservative trajectory is not available (for the following vehicle classes: Class 7, Medium Vocational; Class 8, Refuse Heavy; and Class 8, Vocational Heavy).
- Powertrain Detail Filter: The Detail filter allows the selection of multiple powertrain configurations. For full descriptions of alternative configurations, refer to documentation by Islam et al. (Islam et al., 2023).
- High Production Volume: The estimates from Islam et al. (Islam et al., 2023), and those shown here, represent costs and technology performance at high production volume. Although medium- and heavy-duty (MDHD) diesel hybrid electric vehicles are currently not manufactured at high volume, both MDHD diesel engine and light-duty hybrid electric technologies are mature and high-volume and the high production volume estimates approximately reflect the current state of technology.
- Vehicle Variations: The Transportation ATB presents estimates for representative vehicles in MDHD classes; we do not account for variations in make, model, and trim or for pricing incentives or geographic heterogeneity that influence prices in the market. As a result, representative values shown here may differ from specific models available on the market.
- Technology Advances: Technology advances include changes that may reduce costs or may increase costs while improving performance, which implies costs do not always decline between less- and more-advanced scenarios.
- Nonmonotonic Behavior: Modeled vehicle price trajectories may exhibit nonmonotonic behavior resulting from the combination of advanced technology costs and the impact on engine efficiency. For example, though the engine cost might increase over time because of advanced technologies, the overall engine power required decreases over time because of lightweighting, improved aerodynamics, or other factors. As a result, though per unit of power engine costs might go up, lower engine power requirements decrease the total engine cost.
- Baseline Fuel: The baseline fuel pathway used for this powertrain in the LCOD and emissions estimates is conventional E10 gasoline with starch ethanol. Additional selected fuel pathways can be displayed by choosing Lowest Cost or Lowest Emissions under the Fuel Pathway filter. Additional information about these and other fuels can be found on the Gasoline and Ethanol page.
- Frozen Fuel Price Level: The fuel price and emissions of the selected fuel pathways (e.g., Baseline, Lowest Cost, and Lowest Emissions) are associated with a single year. Because we do not provide a time-series trajectory, here we show fuel price at a frozen level for all years so we can offer a range of fuel price values. In the levelized cost of driving and emissions charts, this approach clearly distinguishes effects of fuels from those of vehicle technologies because fuels remain constant whereas vehicle technologies change over time.
- Fuels References: See fuels and blendstock pages, especially for diesel bio-based blendstock, for a full description of the fuels references, which include (EIA, 2023), (EIA, 2024), (DOE, 2023), (Dutta et al., 2021), (Tao et al., 2017), (Tan et al., 2021), (Wang et al., 2023), (Xie et al., 2011), (Xu et al., 2022), and (Zhu et al., 2020).
- Fuel Economy on Substitutable Fuels: The Transportation ATB assumes the fuel economy (on a miles per gallon gasoline equivalent basis) remains constant when operating on substitutable fuels. In reality, fuel composition may affect engine performance.
The data downloads include additional details of assumptions and calculations for each metric.
Defintions
For detailed definitions, see:
References
The following references are specific to this page; for all references in this ATB, see References.