40 CFR § 610.20 - General.

---
identifier: "/us/cfr/t40/s610.20"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 610.20 - General."
title_number: 40
title_name: "Protection of Environment"
section_number: "610.20"
section_name: "General."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "Q"
subchapter_name: "ENERGY POLICY"
part_number: "610"
part_name: "FUEL ECONOMY RETROFIT DEVICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sec. 511, Motor Vehicle Information and Cost Savings Act, as amended (sec. 301, Pub. L. 94-163, 89 Stat. 915 (15 U.S.C. 2011))."
regulatory_source: "44 FR 17946, Mar. 23, 1979, unless otherwise noted."
cfr_part: "610"
---


# 610.20 General.

The Administrator will employ the following criteria for evaluating the accuracy of fuel economy representations made with respect to retrofit devices:

(a) Device functional category;

(b) Device integrity;

(c) Operator interaction effects;

(d) Validity of test data;

(e) Evaluation of test data;

as these concepts are explained in §§ 610.21 through 610.25 respectively.