{"data":{"id":"us/40-cfr-610.63","jurisdiction":"us","citation":"40 CFR 610.63","heading":"Performance tests.","body":"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.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER Q—ENERGY POLICY","PART 610—FUEL ECONOMY RETROFIT DEVICES","Subpart F—Special Test Procedures"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"b7dfb1fd038a589d51447de248ba2ca42158c04c9688ae91c7ddbdda7b90411e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-610.62","next":"us/40-cfr-610.64"},"notice":"GroundRules: Original legal text. Not legal advice."}