# Medium- and heavy-duty vehicle fuel efficiency — Federal civil penalty maximums — current inflation-adjusted amounts across agencies

For Medium- and heavy-duty vehicle fuel efficiency, agency is National Highway Traffic Safety Administration; maximum penalty is $51,668 per vehicle or engine, recorded from its source on 2026-08-10.

- **Agency:** National Highway Traffic Safety Administration _(our reading, not quoted from the source)_
- **Violation:** Medium- and heavy-duty vehicle fuel efficiency _(verified: appears in the quote below)_
- **Maximum penalty:** $51,668 per vehicle or engine _(verified: appears in the quote below)_

## What the source says

> ( i ) Medium- and heavy-duty vehicle fuel efficiency. The maximum civil penalty for a violation of the fuel consumption standards of <https://www.ecfr.gov/current/title-49/part-535> 49 CFR part 535 is not more than $51,668 per vehicle or engine. The maximum civil penalty for a related series of violations shall be determined by multiplying $51,668 times the vehicle or engine production volume for the model year in question within the regulatory averaging set.

## Source

- https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-578/section-578.6

Last verified: 2026-08-10. Review by: 2027-02-26.
Part of [Federal civil penalty maximums — current inflation-adjusted amounts across agencies](https://referencesource.org/federal-civil-penalty-maximums/).