Fact #952: November 21, 2016 NHTSA and EPA Finalized Medium and Heavy Truck Fuel Efficiency and Greenhouse Gas Standards through Model Year 2027

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The National Highway Traffic Safety Administration (NHTSA) and the Environmental Protection Agency (EPA) finalized Phase II fuel efficiency and greenhouse gas standards for medium and heavy trucks in August 2016. These standards follow the Phase I standards set by the agencies in 2011, but are not directly comparable because several test procedures were changed to better reflect real world operation. There are four regulatory categories covered by the new standards: combination tractors (a truck tractor designed to pull a trailer); trailers pulled by combination tractors; heavy-duty pickup trucks and vans; and vocational vehicles (including buses, refuse trucks, and concrete mixers). There are also separate standards for the engines that power combination tractors and vocational vehicles.

For combination tractors, there are individual standards for class 7 day cabs, class 8 day cabs, and class 8 sleeper cabs, each with different standards for low-, mid-, and high-roofs. There are also class 8 heavy-haul standards (with no roof-style differentiation). The fuel economy standards are specified in terms of gallons of fuel used per thousand ton-mile. The carbon dioxide emission standards are specified in terms of grams per ton-mile. The high-roof combination tractor fuel economy standards shown are only one example of the new regulations that are intended to curb medium and heavy truck fuel use and carbon dioxide emissions.

High-roof Combination Tractor Fuel Consumption Phase II Standards, Model Years 2021, 2024, and 2027

High-roof Combination Tractor Fuel Consumption Phase II Standards for the Model Years 2021, 2024, and 2027

Notes: Values were rounded to one decimal place. See final rule for full standard values, exemptions, and exclusions. A combination tractor is a truck tractor designed to pull a trailer.

Fact #952 Dataset

Supporting Information

High-roof Combination Tractor Fuel Consumption Phase II Standards, Model Years 2021, 2024, and 2027
Model
Year
Day Cab
Class 7
Day Cab
Class 8
Sleeper Cab
Class 8
Heavy Haul
Class 8
202111.149318.408647.436155.14735
202410.471517.897846.944994.93124
20279.823187.436156.316314.74460

Note: For heavy-haul tractors, the standard is the same for low-, mid-, and high-roof tractors.
Source: Federal Register, Vol. 81, No. 206, Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles - Phase 2, Tuesday, October 25, 2016.

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