Maps and Data - Average Fuel Economy at Different Road Grades
Find maps and charts showing transportation data and trends related to alternative fuels and vehicles.
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Vehicles: AFVs and HEVs
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AFV Acquisitions by Regulated Fleets (by Fleet Type)
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AFV Acquisitions by Regulated Fleets (by Fuel Type)
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AFV and HEV Model Offerings, By Manufacturer
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ARRA Electrification Projects
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Annual Vehicle Credits Earned and Used by Regulated Fleets
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BioFuels Atlas
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Biodiesel Purchases by EPAct-Regulated Fleets
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Clean Cities Alternative Fuel and Advanced Vehicle Inventory
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Clean Cities Petroleum Savings by AFV Type
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Exemptions from EPAct by Regulated Fleets
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Light-Duty AFV, HEV, and Diesel Model Offerings, By Fuel Type
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On-Road AFVs Made Available by Year
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TransAtlas
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Types of Vehicles by Weight Class
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U.S. HEV Sales by Model
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U.S. Plug-in Electric Vehicle Sales by Model
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U.S. Transit Buses by Fuel Type
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Vehicle Credits Traded by Regulated Fleets
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Vehicle Weight Classes & Categories
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Vehicles: Fuel Consumption and Efficiency
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Average Annual Fuel Use of Major Vehicle Categories
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Average Annual Vehicle Miles Traveled of Major Vehicle Categories
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Average Fuel Economy at Different Road Grades
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Average Fuel Economy of Major Vehicle Categories
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Average Per-Passenger Fuel Economy of Various Travel Modes
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Clean Cities Petroleum Savings by Fuel Economy and VMT Reductions
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Average Fuel Economy at Different Road Grades
-5% | -4% | -3% | -2% | -1% | 0% | 1% | 2% | 3% | 4% | 5% | |
Midsize Sedan CV | 2.2123227498120186 | 2.3676616452226704 | 2.4957700646220125 | 2.636553348642097 | 2.982695746841343 | 3.213049168323817 | 3.7947099421233994 | 4.368556382225906 | 5.025996675413267 | 5.585506182994677 | 6.114217819808835 |
Midsize Sedan HEV | 0.06471518799422755 | 0.12071600014920861 | 0.38710979880830854 | 0.852631071086249 | 1.4778285167273815 | 1.982395144086719 | 2.459731696562222 | 3.0645302129267735 | 3.664884515843766 | 4.231399756380166 | 4.901545916710673 |
SUV CV | 3.065539608604173 | 3.273855523510499 | 3.4208361909115643 | 3.589394941202374 | 4.033754789367468 | 4.324228778886487 | 5.127724528576058 | 5.9148312577682605 | 6.82831985483853 | 7.6129614594196795 | 8.318293132500528 |
SUV HEV | 0.1473609150416523 | 0.2839799317354622 | 0.7415337357049412 | 1.401011103070829 | 2.2714262010919803 | 2.995425496301589 | 3.654543601245803 | 4.495553904190317 | 5.301192512295914 | 6.067823170637369 | 7.027572988237496 |
Midsize Sedan BEV | 0.06835185897300808 | 0.09554780711770813 | 0.1870588137526468 | 0.3370352002267759 | 0.5681504177346842 | 0.7592989231518441 | 0.9200317010408517 | 1.1362519429862545 | 1.336960439408474 | 1.5158252636127008 | 1.7774524010463741 |
Source: National Renewable Energy Laboratory: Contribution of Road Grade to the Energy Use of Modern Automobiles Across Large Datasets of Real-World Drive Cycles, January 2014.
Notes: The majority of available data was at the 0% road grade. The amount of data tapers off with grade until it is not significant at 6% grade.
This chart shows how many gallons five different vehicle types consume over a hundred-miles as the road grade increases from -5 to 5 percent. As the hybrid electric vehicles and battery electric vehicles go downhill, their consumption reduces down to zero gallons per hundred miles due to their regenerative breaking systems. However, the conventional vehicles still require fuel at -5% grade. On an uphill grade, all cars consume more gallons than at a 0% grade. Hybrid-electric vehicles and battery electric vehicles' fuel consumption increases steadily as road grade increases from -3% to 5%. On the other hand, conventional vehicles consumption increases steadily as the slope changes from downhill to flat and drastically increases on uphill inclines. Both SUVs were more affected by incline than their sedan counterparts, most likely because they are heavier.
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