---
kind: "section"
citation: "49 C.F.R. § 533.4"
title: "49"
number: "533.4"
heading: "Definitions."
url: "https://uscodex.org/cfr/49/533.4"
---

# §533.4. Definitions.

- (a) **Statutory terms.**
  - (1) The terms average fuel economy, average fuel economy standard, fuel economy, import, manufacture, manufacturer, and model year are used as defined in [49 U.S.C. 32901](/usc/49/32901.md).
  - (2) The term automobile is used as defined in [49 U.S.C. 32901](/usc/49/32901.md) and in accordance with the determinations in [part 523](/cfr/49/part523.md) of this chapter.
- (b) **Other terms.** As used in this part, unless otherwise required by the context—
  - (1) **Light truck—** is used in accordance with the determinations in [part 523](/cfr/49/part523.md) of this chapter.
  - (2) Captive import means with respect to a light truck, one which is not domestically manufactured, as defined in [section 502(b)(2)(E)](/cfr/49/502.md?p=b-2-E) of the Motor Vehicle Information and Cost Savings Act, but which is imported in the 1980 model year or thereafter by a manufacturer whose principal place of business is in the United States.
  - (3) 4-wheel drive, general utility vehicle means a 4-wheel drive, general purpose automobile capable of off-highway operation that has a wheelbase of not more than 280 centimeters, and that has a body shape similar to 1977 Jeep CJ-5 or CJ-7, or the 1977 Toyota Land Cruiser.
  - (4) Basic engine means a unique combination of manufacturer, engine displacement, number of cylinders, fuel system (as distinguished by number of carburetor barrels or use of fuel injection), and catalyst usage.
  - (5) Limited product line light truck means a light truck manufactured by a manufacturer whose light truck fleet is powered exclusively by basic engines which are not also used in passenger automobiles.

## Notes

### Amendments

[89 FR 52949, June 24, 2024]

### Authority

Authority: 49 U.S.C. 32902; delegation of authority at 49 CFR 1.95.

### Source

Source: 87 FR 26076, May 2, 2022, unless otherwise noted.

### Amendments

[89 FR 52949, June 24, 2024]