NHTSA Medium- and Heavy-Duty Fuel Economy Program
Current understanding
To be populated as evidence accumulates.
Evidence log
- 2026-08-31 — Resetting NHTSA’s Fuel Economy Program: Commercial Medium- and Heavy-Duty On-Highway Vehicles and Work Trucks: Final rule (“Resetting NHTSA’s Fuel Economy Program”) in which NHTSA disclaims statutory authority to set fuel-economy standards for engines alone, limits its program to complete commercial medium- and heavy-duty vehicles/work trucks, and immediately halts enforcement of engine-only standards pending a rewrite. (novelty: 3)
Open questions
Related
Contributing findings
Resetting NHTSA's Fuel Economy Program: Commercial Medium- and Heavy-Duty On-Highway Vehicles and Work Trucks
31-aug-2026
novelty 3
per-area 3
weakens