Impact of Technology on Electric Drive Fuel Consumption and Cost

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1 SAE Impact of Technology on Electric Drive Fuel Consumption and Cost Copyright 2012 SAE International A. Moawad, N. Kim, A. Rousseau Argonne National Laboratory ABSTRACT In support of the U.S Department of Energy s Vehicle Technologies Program, numerous vehicle technology combinations have been simulated using Autonomie. Argonne National Laboratory (Argonne) designed and wrote the Autonomie modeling software to serve as a single tool that could be used to meet the requirements of automotive engineering throughout the development process, from modeling to control, offering the ability to quickly compare the performance and fuel efficiency of numerous powertrain configurations. For this study, a multitude of vehicle technology combinations were simulated for many different vehicles classes and configurations, which included conventional, power split hybrid electric vehicle (HEV), power split plug-in hybrid electric vehicle (PHEV), extendedrange EV (E-REV)-capability PHEV, series fuel cell, and battery electric vehicle. In this paper, the results are examined to compare the extent to which each of these technologies reduces fuel consumption and which combination of technologies produces the best trade-off between cost and fuel consumption. The main questions are whether it is cost effective to use advanced technologies, such as PHEVs, and how far we should or could electrify vehicles to obtain fuel consumption improvements at reasonable costs. Several timeframes are considered 2010, 2015, 2020, 2030, and 2045 to track electric drive evolution through time. INTRODUCTION The U.S. Department of Energy (DOE) Vehicle Technologies Program (VTP) is developing more energy-efficient and environmentally friendly highway transportation technologies that will enable America to use less petroleum. The long-term aim is to develop leapfrog technologies that will provide Americans with greater freedom of mobility and energy security, while lowering costs and reducing impacts on the environment. The DOE VTP examines pre-competitive, high-risk research needed to develop the: Component and infrastructure technologies necessary to enable a full range of affordable cars and light trucks. Fueling infrastructure to reduce the dependence of the nation s personal transportation system on imported oil and minimize harmful vehicle emissions, without sacrificing freedom of mobility and freedom of vehicle choice. As part of this ambitious program, numerous technologies are addressed, including engines, energy storage systems, fuel-cell systems, hydrogen storage, electric machines, and materials, among others. The 1993 Government Performance and Results Act (GPRA) holds federal agencies accountable for using resources wisely and achieving program results. GPRA requires agencies to develop plans for what they intend to accomplish, measure how well they are doing, make appropriate decisions on the basis of the information they have gathered, and communicate information about their performance to Congress and to the public. Every year, a report is published [1] to assess the results and benefits of the different programs. Owing to the large number of component and powertrain technologies considered, the benefits were simulated using Autonomie [2]. Argonne designed Autonomie to serve as a single tool that can be used to meet the requirements of automotive engineering throughout the development process, from modeling to control. Autonomie, a forward-looking model developed using MathWorks tools, offers the ability to quickly compare powertrain configurations and component technologies from a performance and fuel-efficiency point of view. Page 1 of 18

2 The current study evaluates the benefits of the light-duty vehicle research conducted at the U.S. Department of Energy from fuel efficiency and cost perspectives. AUTONOMIE SOFTWARE A detailed description of the software can be found in the recent Light-Duty Vehicle Fuel Consumption Displacement Potential up to 2045 report. [15] METHODOLOGY To evaluate the fuel-efficiency benefits of advanced vehicles, each vehicle is designed from the ground up based on each component s assumptions. The fuel efficiency is then simulated using the Urban Dynamometer Driving Schedule (UDDS) and Highway Federal Emissions Test (HWFET) cycles. The vehicle costs are calculated from the components characteristics (power, energy, weight, etc.). Both the cost and fuel efficiency values are then used to define the market penetration of each technology and finally to estimate the amount of fuel saved. The process is highlighted in Figure 1. This paper will focus on the first phase of the project: fuel efficiency and cost. Assumptions Vehicle Simulation Fuel Electricity Cost Market Penetration Fuel Saved Figure 1 - Process to evaluate vehicle fuel efficiency and cost of advanced technologies To properly assess the benefits of future technologies, several options were considered, as shown in Figure 2: Five vehicle classes: compact, midsize car, small sports utility vehicle (SUV), medium SUV, and pickup truck; Six timeframes: reference ( Ref, same as 2010 low), 2010, 2015, 2020, 2030, and 2045; Five powertrain configurations: conventional, HEV, PHEV, fuel-cell HEV, and EV; Four fuels: gasoline, diesel, ethanol, and hydrogen; and Three risk levels: low, average, and high cases. These correspond, respectively, to 10% uncertainty (aligned with original equipment-manufacturer [OEM] improvements based on regulations), 50% uncertainty, and 90% uncertainty (aligned with aggressive technology advancement based on the DOE VTP). These levels are explained more fully below. Overall, more than 2,000 vehicles were defined and simulated in Autonomie. This paper does not address micro or mild hybrids and does not focus on emissions. Page 2 of 18 Figure 2 - Vehicle classes, timeframes, configurations, fuels, and risk levels considered

3 For each component, assumptions were made (i.e., efficiency, power density), and three separate values were defined to represent the (1) 90th percentile, (2) 50th percentile, and (3) 10th percentile. A 90% probability means that the technology has a 90% chance of being available at the time considered. For each vehicle considered, the cost assumptions also follow the triangular uncertainty (Figure 3). Each set of assumptions, however, is used for each vehicle, and the most efficient components are not automatically the cheapest. As a result, for each vehicle considered, we simulated three options for fuel efficiency. Each of these three options also has three values representing the cost uncertainties [3]. Hereafter this uncertainty will be represented in the figures with an error bar. Figure 3 - Uncertainty process description The reference case used in the study is considered to be the low-uncertainty 2010 case. 1. COMPONENT ASSUMPTIONS 1.A ENGINE Several state-of-the-art internal combustion engines (ICEs) were selected as the baseline for the fuels considered: gasoline (spark ignition or SI), diesel (compression ignition or CI), ethanol (E85), and hydrogen (H 2 ). The gasoline, diesel, and ethanol engines used for reference conventional vehicles were provided by automotive car manufacturers, while the port-injected hydrogen engine data were generated at Argonne [5]. The engines used for HEVs and PHEVs are based on Atkinson cycles, generated from test data collected at Argonne s dynamometer testing facility [4]. Table 1 shows the engines selected as a baseline for the study. Table 1 - Engines selected Fuel Source Displacement (L) Peak Power (kw) SI (Conventional) Car Manufacturer CI Car Manufacturer H 2 Argonne E85 (Conventional) Car Manufacturer SI/E85 (HEV) Argonne The peak efficiencies of the different fuels and technologies are shown in Figure 4. Page 3 of 18

4 1.B FUEL CELL SYSTEM Figure 4 ICE peak efficiency for diesel, hydrogen, and gasoline fuels Extensive research and development is being conducted on fuel-cell (FC) vehicles because of their potential for high efficiency and low (even zero) emissions. Because fuel-cell vehicles remain expensive and demand for hydrogen is limited at present, very few fueling stations are being built. To try to accelerate the development of a hydrogen economy, some OEMs in the automotive industry have been working on a hydrogen-fueled ICE as an intermediate step. Figure 5 shows the evolution of the fuel-cell system peak efficiencies. Currently, the peak fuel-cell efficiency is assumed to be at 55% and is projected to increase to 60% by A value of 60% has already been demonstrated in laboratories and therefore is expected to be implemented soon in vehicles. The peak efficiencies will remain constant in the future, as most research is expected to focus on reducing cost and increasing durability. Figure 5 - Fuel-cell system efficiency Figure 6 shows that the costs are projected to lower from a current level of $80/kW (values based on high production volume) to an average of $25/kW in 2045 (with uncertainty ranging from between $15 to $30/kW). These costs are based on an assumed production of 500,000 units per year. Page 4 of 18

5 1.C HYDROGEN STORAGE Figure 6 - Fuel-cell system cost The evolution of hydrogen storage systems is vital to the introduction of hydrogen-powered vehicles. As in the case of the fuel-cell systems, all of the assumptions used for hydrogen storage were based on values provided by DOE. Overall, the volumetric capacity dramatically increases between the reference case and 2045 (Figure 7). 1.D ELECTRIC MACHINE Figure 7 - Hydrogen storage capacity in terms of hydrogen quantity Two different electric machines will be used as references in the study: The power-split vehicles run with a permanent magnet electric machine (similar to that used in the Toyota Camry [6]), which has a peak power of 105 kw and a peak efficiency of 95%. The series configuration (fuel cell) and electric vehicles use an induction electric machine with a peak power of 72 kw and a peak efficiency of 95%. Page 5 of 18

6 Figure 8 - Motor power and peak efficiency values 1.E ENERGY SYSTEM STORAGE The battery used for the HEV reference case is a nickel metal Hydride (NiMH) battery. It is assumed that this technology is the most likely to be used until The model used is similar to the one found in the Toyota Prius. For PHEV applications, all of the vehicles are run with a lithium-ion battery model from Argonne [7]. After a long period of time, batteries lose some of their power and energy capacity. To maintain the same performance at the end of life (EOL) compared to the beginning of life (BOL), an oversize factor is applied while sizing the batteries for both power and energy. These factors are supposed to represent the percentage of power and energy that will not be provided by the battery at the EOL as compared to the initial power and energy given by the manufacturer. The oversize factor is reduced over time to reflect an improvement in the ability of batteries to deliver the same (uniform) performance throughout their life cycles (Figure 9). Page 6 of 18 Figure 9 Battery oversizing factors and SOC window. Figure 10 shows battery cost. The battery cost for HEV applications will decrease over time for all cases, but the reduction is more aggressive for the high case between 2010 and The batteries are expected to be less than one-half the cost in the 2045 high case.

7 PHEV and EV battery energy costs are very close to each other. For both, the battery cost significantly decreases over time, starting at $600/kWh and ending up, in the 2045 high case, at $100/kWh for PHEVs and EVs. 1.F VEHICLE Figure 10 - Battery cost One of the main factors affecting fuel consumption is vehicle weight. Lowering the weight ( lightweighting ) reduces the forces required to follow the vehicle speed trace. As a result, the components can be downsized, resulting in the use of smaller components and decreased fuel consumption. However, the impact of lightweighting is not the same for all of the powertrain configurations, with studies showing that the technology has greater influence in lowering fuel consumption in conventional vehicles than it does in their electric-drive counterparts [8] (Figure 11). Figure 11 Glider mass and cost Reductions in rolling resistance, frontal area, and drag coefficient also have the potential to improve fuel consumption significantly, as these factors also lead to a reduction in the force required at the wheel (Figure 12). Page 7 of 18

8 Figure 12 Frontal area, drag coefficient and rolling resistance for all classes. 2. VEHICLE TECHNICAL SPECIFICATIONS All of the vehicles have been sized to meet the same requirements: Initial vehicle movement (IVM) to 60 mi/h in 9 sec +/ 0.1 sec, Maximum grade of 6% at 65 mi/h at gross vehicle weight (GVW), and Maximum vehicle speed >100 mi/h. These requirements are a good representation of the current American automotive market as well as American drivers expectations. Table 2 summarizes the travel distances with a full tank of fuel for the different powertrains. The vehicles using gasoline, diesel, or ethanol fuel have been sized for a distance of 500 miles on the combined driving cycle based on unadjusted fuel consumption. All vehicles have a range of at least 320 miles except the EV (150 miles) and the hydrogen vehicles. Table 2 - Travel distances in miles Timeframe Vehicle Type Ref Conv. H HEV H 2, FC PHEV H 2, FC AER a AER AER AER AER AER EV a AER = all-electric range. Input mode power-split configurations, similar to those used in the Toyota Camry, were selected for all HEV and PHEV applications using engines. The series fuel cell configurations use a two-gear transmission to be able to achieve the maximum vehicle speed requirement. The vehicle-level control strategies employed for each configuration have been defined in previous publications [9, 10, 11, 12, 13, and 14]. 3. VEHICLE SIZING Page 8 of 18

9 Several automated sizing algorithms were developed to provide a fair comparison between technologies. These algorithms are specific to the powertrain (i.e., conventional, power-split, series, electric) and the application (i.e., HEV, PHEV). As shown in Figure 13, the engine power for all of the powertrains decreases over time. The powertrain power-split HEV is the one with the highest engine power reduction ranging from 6% to 36%, whereas power for the conventional engine decreases only by 3% to 27%. The engine power is higher when the all-electric range (AER) range increases because the power is sized on the basis of acceleration and grade and because the different PHEVs (for the same fuel) vary from one another only by having a successively larger battery (and thus a heavier car). Figure 13 - Engine power for gasoline powertrain for a midsize car The ICE power changes linearly with the vehicle mass, as shown in Figure 14. Thus, for every 100-kg reduction to the vehicle mass, the engine power decreases by approximately 10 kw. Power in kw SI Conv CI Conv H2 Conv E85 Conv Mass in kg Figure 14 - Vehicle mass vs. power Figure 15 shows the electric machine power for the gasoline HEVs and PHEVs. The electric machines used for the PHEV10 and PHEV20 cases are sized to have the ability to follow the UDDS drive cycle in EV mode, while those used for the PHEV30 and PHEV40 cases allow the vehicles to follow the US06 drive cycle. It is important to note the fact that the vehicles have the ability to drive the UDDS in electric mode the control strategy employed during fuel efficiency simulation which is based on blended operation. However, the power does not increase significantly compared to HEVs for the power-split configuration. Page 9 of 18

10 Figure 15 - Electric machine power for gasoline HEV and PHEVs for a midsize vehicle Figure 16 shows the battery power for HEV, PHEV, and EV applications. The sensitivity of battery power to vehicle mass increases with the degree of electrification (i.e., it is higher for battery electric vehicles [BEVs], then PHEVs, and finally HEVs). y 200 SI Split HEV SI PHEV FC HEV 150 FC PHEV BEV Power in kw Mass in kg VEHICLE SIMULATION RESULTS Figure 16 - Battery power vs. vehicle mass The vehicles were simulated on both the UDDS and HWFET drive cycles. The fuel consumption values and ratios presented in Table 3 are based on unadjusted values. The cold-start penalties were defined for each powertrain technology option on the basis of available data collected at Argonne s dynamometer facility and available in the literature. This percentage is the penalty applied after simulation to the fuel Economy value since all simulations are assumed to run under hot conditions. Page 10 of 18

11 Table 3 Cold-start penalty values Powertrain Ref Conventional 12% Power-Split HEV 8% Power-Split PHEV 6% Fuel Cell HEV 0% Fuel Cell PHEV 0% Electric 5% 4.A EVOLUTION OF HEVs VS. CONVENTIONAL VEHICLES The comparisons between power-split HEVs and conventional gasoline vehicles (same year, same case) in Figure 17 show that the ratios increase slightly for diesel, gasoline, and ethanol. However, the hydrogen case shows a decrease over time: the hydrogen HEV consumes 31% in 2010 and 40% less in 2045, meaning that hydrogen vehicles will benefit more from hybridization in the future than will comparable conventional vehicles. Figure 17 - Ratio of fuel consumption gasoline equivalent (unadjusted combined) in comparison to the conventional gasoline same year, same case, for midsize Figure 18 shows the vehicle cost ratios between HEVs and conventional vehicles. As expected, HEVs remain more expensive than do conventional vehicles; however, the difference significantly decreases because costs associated with the battery and electric machine fall faster than do those of conventional engines. Page 11 of 18

12 Figure 18 - HEV vehicle cost ratio compared to gasoline conventional vehicle of the same year 4.B EVOLUTION OF HEVs VS. FUEL CELL VEHICLES Figure 19 shows the fuel consumption comparison between HEVs and FC HEVs for the case of the midsize car. First, note that technology for fuel cell vehicles will continue to provide better fuel efficiency than the technology for the HEVs, with ratios above 1. However, the ratios vary over time, depending upon the fuel considered. The ratio for the gasoline HEV increases over time because most improvements considered for the engine occur at low power and consequently do not significantly impact the fuel efficiency in hybrid operating mode. Both diesel and ethanol HEVs follow the same trend than the gasoline. Because of the larger improvements considered for the hydrogen engine, the hydrogen power split shows the best improvement in fuel consumption in comparison to the fuel cell technology. Indeed, in 2010, the hydrogen HEV vehicle consumes nearly 18% more fuel than the fuel cell HEV vehicle, but in 2045, this difference is reduced to 9%. Page 12 of 18 Figure 19 - Ratio of fuel consumption gasoline equivalent unadjusted combined in comparison to the fuel cell HEV same year, same case for midsize vehicles Figure 20 shows the vehicle cost comparison between HEVs and FC HEVs. Note that the cost difference between both technologies is expected to decrease over time. The diesel fuel will become more expensive for all technology uncertainty cases, with a ratio ranging from 1.02 to 1.1.

13 Figure 20 - HEV vehicle cost ratio compared to an FC HEV vehicle of the same year 4.C EVOLUTION OF PHEVS The fuel consumption evolution for power-split PHEVs is similar to that of power-split HEVs with a gasoline engine (Figure 21). Figure 21 - Fuel consumption evolution for PHEVs, gasoline engine, midsize car Table 4 shows and confirms that PHEVs improvement ranges from 10% to 50% with gasoline engines for the HEV powertrain. Table 4 - Fuel consumption (l/100km) of PHEVs for gasoline engine for midsize vehicle Page 13 of 18 Ref Low High Percentage Improvement Low High Conventional HEV PHEV PHEV PHEV PHEV

14 Electric consumption tends to decrease over time for all PHEV ranges because vehicle becomes lighter and therefore component sizing smaller; however, notice that E-REV electric consumption is almost twice as much as that of split. This result is attributable to the configuration itself in addition to the fact that the vehicles are being sized on US06 drive cycles for the E-REV, so more power is needed to follow the cycle leading to bigger component sizes. Figure 22 - Electric consumption for PHEVs, gasoline engine, midsize car Figure 23 shows that there is a linear relationship between vehicle mass and electric consumption: the larger the vehicle, the higher the electrical consumption. It can be said that for every 200-kg decrease in mass, there is a 50 Wh/mile reduction in electric consumption. Electric Consumption (Wh/mile) Compact Midsize Small SUV Midsize SUV Pickup Vehicle Mass (kg) Figure 23 - Electric consumption in charge-depleting (CD) + charge sustaining (CS) modes for gasoline-powered split PHEVs Page 14 of 18

15 4.D TRADE-OFF BETWEEN FUEL EFFICIENCY AND COST Figure 24 shows similar trends for HEVs independent of ICE technology. The overall trend is decreasing, which means lower fuel consumption and lower cost. Gasoline and ethanol HEVs offer the best trade-offs over time, with the hydrogen HEV becoming competitive in the 2045 timeframe. Cost ($) Ref Dark Blue = SI Green = CI Yellow = H2 Red = E Fuel Consumption (gallons/100mile) 0.5 Figure 24 - Incremental Cost vs. fuel consumption for Midsize HEV Figure 25 shows a comparison of all of the powertrains, considering gasoline fuel only. The main conclusion is that conventional vehicles are more likely to improve in fuel efficiency than in cost, whereas the higher the electrification level, the more the improvement focuses on cost. For example, the incremental cost for the PHEV40 decreases from $31,950 to $6,236 between 2010 and 2045, whereas the incremental cost for the conventional gasoline vehicle increases from $0 to $845 over the same period. Cost ($) 4 x Dark Blue = Conv Green = Split HEV Orange = Split PHEV10 Red = Split PHEV20 Light Blue = Erev PHEV30 Yellow = Erev PHEV Fuel Consumption (gallons/100mile) 0 Page 15 of 18 Figure 25 - Incremental cost (in comparison to the reference conventional gasoline vehicle manufacturing cost) as a function of fuel consumption for gasoline vehicles Figure 26 shows the trade-offs between fuel consumption and increased costs for all powertrains and fuels compared to the conventional gasoline reference. Overall, the vehicles on the bottom right would provide the best fuel consumption for the least additional cost. All years, all cases, and all fuels are presented.

16 Cost ($) 4 x Conv Split HEV Split PHEV FC HEV FC PHEV Fuel Consumption (gallons/100mile) 0 Figure 26 - Incremental cost (in comparison to the gasoline conventional reference vehicle) as a function of fuel consumption for all powertrains. REFERENCES [1] Available at: [2] Available at: [3] Henrion, M. (2008). Guide to Estimating Unbiased Probability Distributions for Energy R&D Results. DOE Risk Analysis Group. [4] Bohn, T.A. (2005). Implementation of a Non-Intrusive In-Vehicle Engine Torque Sensor for Benchmarking the Toyota Prius HEV. SAE paper , presented at the SAE World Congress & Exhibition, Detroit, Mich., April. [5] Wallner, T., and H. Lohse-Busch (2007). Performance, Efficiency, and Emissions Evaluation of a Supercharged, Hydrogen- Powered, 4-Cylinder Engine. SAE paper , presented at the SAE Fuels and Emissions Conference, Capetown, South Africa, January. Available at: [6] Olszewski, M. (2008). Evaluation of the 2007 Toyota Camry Hybrid Synergy Drive System, Report for the U.S. Department of Energy, Jan. [7] Sharer, P., A. Rousseau, P. Nelson, and S. Pagerit (2006). Vehicle Simulation Results for PHEV Battery Requirements, 22nd International Electric Vehicle Symposium (EVS22), Yokohama, Oct. [8] Pagerit, S., P. Sharer, and A. Rousseau (2006). Fuel Economy Sensitivity to Vehicle Mass for Advanced Vehicle Powertrains. SAE paper , presented at the SAE World Congress & Exhibition, Detroit, Mich., April. [9] Freyermuth, V., E. Fallas, and A. Rousseau (2008). Comparison of Powertrain Configuration for Plug-in HEVs from a Fuel Economy Perspective, SAE paper , SAE World Congress, Detroit, Mich., April. [10] Rousseau, A., P. Sharer, S. Pagerit, and M. Duoba (2006). Integrating Data, Performing Quality Assurance, and Validating the Vehicle Model for the 2004 Prius Using PSAT, SAE paper , SAE World Congress, Detroit, Mich., April. [11] Pagerit, S., A. Rousseau, and P. Sharer (2005). Global Optimization to Real Time Control of HEV Power Flow: Example of a Fuel Cell Hybrid Vehicle, 20th International Electric Vehicle Symposium (EVS20), Monaco, April. [12] Sharer, P., A. Rousseau, D. Karbowski, and S. Pagerit (2008). Plug-in Hybrid Electric Vehicle Control Strategy: Comparison between EV and Charge-Depleting Options, SAE paper , SAE World Congress, Detroit, Mich., April. [13] Cao, Q., S. Pagerit, R. Carlson, and A. Rousseau (2007). PHEV Hymotion Prius Model Validation and Control Improvements, 23rd International Electric Vehicle Symposium (EVS23), Anaheim, Calif., Dec. [14] Karbowski, D., A. Rousseau, S. Pagerit, and P. Sharer (2006). Plug-in Vehicle Control Strategy: From Global Optimization to Real Time Application, 22nd International Electric Vehicle Symposium (EVS22), Yokohama, Japan, Oct. [15] Moawad, A., Sharer, P., Rousseau, A. Light-Duty Vehicle Fuel Consumption Displacement Potential up to Report at: CONTACT INFORMATION Page 16 of 18

17 Aymeric Rousseau Vehicle Modeling and Simulation Manager (630) Ayman Moawad Research Engineer (630) ACKNOWLEDGMENTS This study was supported by the United States Department of Energy s (DOE s) FreedomCAR and Vehicle Technology Office under the direction of David Anderson and Lee Slezak. The submitted report has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a DOE Office of Science laboratory, is operated under Contract No. DE-AC02-06CH The U.S. Government retains for itself, and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. DEFINITIONS/ABBREVIATIONS AER Argonne BEV BOL CD CI CS DOE E85 EOL E-REV FC GPRA H 2 HEV HWFET ICE NiMH OEM PHEV PHEV 10 and 20 PHEV 30 and 40 PSAT SI SUV all-electric range Argonne National Laboratory battery-powered electric vehicle beginning-of-life charge depleting compression ignition charge sustaining U.S. Department of Energy blend of 85% ethanol and 15% gasoline by weight end of life extended-range EV fuel cell Government Performance and Results Act hydrogen hybrid electric vehicle Highway Federal Emissions Test internal combustion engine nickel metal hydride original equipment manufacturer plug-in hybrid electric vehicle PHEV with 10 or 20 miles of all-electric range PHEV with 30 or 40 miles of all-electric range Powertrain System Analysis Toolkit spark ignition sport utility vehicle UDDS Urban Dynamometer Driving Schedule Page 17 of 18

18 US06 VTP duty cycle with aggressive highway driving Vehicle Technologies Program (DOE) Page 18 of 18

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