Site Feedback

Title 40

Displaying title 40, up to date as of 7/16/2026. Title 40 was last amended 7/16/2026.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 40Protection of EnvironmentPart / Section
Chapter IEnvironmental Protection Agency1 – 1099
Subchapter QEnergy Policy600 – 699
Part 600Fuel Economy and Greenhouse Gas Exhaust Emissions of Motor Vehicles600.001 – 600.513-08
Subpart AGeneral Provisions600.001 – 600.011
Subpart BFuel Economy and Exhaust Emission Test Procedures600.101 – 600.117
Subpart CProcedures for Calculating Fuel Economy and Carbon-Related Exhaust Emission Values600.206-12 – 600.210-12
§ 600.206-12Calculation and use of FTP-based and HFET-based fuel economy, CO2 emissions, and carbon-related exhaust emission values for vehicle configurations.
§ 600.207-12Calculation and use of vehicle-specific 5-cycle-based fuel economy and CO2 emission values for vehicle configurations.
§ 600.208-12Calculation of FTP-based and HFET-based fuel economy, CO2 emissions, and carbon-related exhaust emissions for a model type.
§ 600.209-12Calculation of vehicle-specific 5-cycle fuel economy and CO2 emission values for a model type.
§ 600.210-12Calculation of fuel economy and CO2 emission values for labeling.
Subpart DFuel Economy Labeling600.301 – 600.316-08
Subpart EDealer Availability of Fuel Economy Information600.405-08 – 600.407-08
§ 600.405-08Dealer requirements.
§ 600.407-08Booklets displayed by dealers.
Subpart FProcedures for Determining Manufacturer's Average Fuel Economy600.502 – 600.513-08
Appendix I to Part 600
Highway Fuel Economy Driving Schedule
Appendix II to Part 600
Sample Fuel Economy Calculations
Appendix III to Part 600
Sample Fuel Economy Label Calculation
Appendixes IV-V to Part 600 [Reserved]
Appendix VI to Part 600
Sample Fuel Economy Labels and Style Guidelines for 2013 and Later Model Years
Appendix VII to Part 600 [Reserved]