# Medium- and Heavy-Duty Vehicle Fuel Efficiency Program
> **US Department of Transportation** · Rule · Published 2015-07-23 · 80 FR 43631
## Document
- **Document number:** 2015-18073
- **Category:** other
- **Sub-agency:** US Department of Transportation
- **Federal Register citation:** 80 FR 43631
- **CFR reference:** 49 CFR 535
- **Publication date:** 2015-07-23
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/07/23/2015-18073/medium--and-heavy-duty-vehicle-fuel-efficiency-program)
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