40 CFR § 610.63 - Performance tests.

---
identifier: "/us/cfr/t40/s610.63"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 610.63 - Performance tests."
title_number: 40
title_name: "Protection of Environment"
section_number: "610.63"
section_name: "Performance tests."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 610.63 Performance tests.

The effect of a device on a vehicle's performance will be determined by performing wide-open-throttle 0 to 60 mph acceleration tests (at normal ambient temperatures) on the baseline vehicle configuration, on the adjusted configuration (if required), and on the fully retrofitted configuration. Tests will be conducted on a dry, level, smooth-surfaced test track, with appropriate speed-time measuring equipment, on as many vehicles as determined to be necessary.