{"data":{"id":"us/40-cfr-1066.805","jurisdiction":"us","citation":"40 CFR 1066.805","heading":"Road-load power, test weight, and inertia weight class determination.","body":"(a) Simulate a vehicle's test weight on the dynamometer using the appropriate equivalent test weight shown in Table 1 of this section. Equivalent test weights are established according to each vehicle's test weight basis, as described in paragraph (b) of this section. Table 1 also specifies the inertia weight class corresponding to each equivalent test weight; the inertia weight class allows for grouping vehicles with a range of equivalent test weights. Table 1 follows:\nTable 1 of § 1066.805—Equivalent Test Weights (pounds)\nTest weight Equivalent test Inertia weight\nUp to 1062 1000 1000\n1063 to 1187 1125 1000\n1188 to 1312 1250 1250\n1313 to 1437 1375 1250\n1438 to 1562 1500 1500\n1563 to 1687 1625 1500\n1688 to 1812 1750 1750\n1813 to 1937 1875 1750\n1938 to 2062 2000 2000\n2063 to 2187 2125 2000\n2188 to 2312 2250 2250\n2313 to 2437 2375 2250\n2438 to 2562 2500 2500\n2563 to 2687 2625 2500\n2688 to 2812 2750 2750\n2813 to 2937 2875 2750\n2938 to 3062 3000 3000\n3063 to 3187 3125 3000\n3188 to 3312 3250 3000\n3313 to 3437 3375 3500\n3438 to 3562 3500 3500\n3563 to 3687 3625 3500\n3688 to 3812 3750 3500\n3813 to 3937 3875 4000\n3938 to 4125 4000 4000\n4126 to 4375 4250 4000\n4376 to 4625 4500 4500\n4626 to 4875 4750 4500\n4876 to 5125 5000 5000\n5126 to 5375 5250 5000\n5376 to 5750 5500 5500\n5751 to 6250 6000 6000\n6251 to 6750 6500 6500\n6751 to 7250 7000 7000\n7251 to 7750 7500 7500\n7751 to 8250 8000 8000\n8251 to 8750 8500 8500\n8751 to 9250 9000 9000\n9251 to 9750 9500 9500\n9751 to 10250 10000 10000\n10251 to 10750 10500 10500\n10751 to 11250 11000 11000\n11251 to 11750 11500 11500\n11751 to 12250 12000 12000\n12251 to 12750 12500 12500\n12751 to 13250 13000 13000\n13251 to 13750 13500 13500\n13751 to 14000 14000 14000\n(b) The test weight basis for non-MDPV heavy-duty vehicles is “adjusted loaded vehicle weight”. For all other vehicles, the test weight basis for establishing equivalent test weight is “loaded vehicle weight”. These load terms are defined in 40 CFR 86.1803.\n(c) For FTP, US06, SC03, New York City Cycle, HFET, and LA-92 testing, determine road-load forces for each test vehicle at speeds between 9.3 and 71.5 miles per hour. The road-load force must represent vehicle operation on a smooth, level road with no wind or calm winds, no precipitation, an ambient temperature of approximately 20 °C, and atmospheric pressure of 98.21 kPa. You may extrapolate road-load force for speeds below 9.3 mi/hr.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1066—VEHICLE-TESTING PROCEDURES","Subpart I—Exhaust Emission Test Procedures for Motor Vehicles"],"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":"265323402d5366bb1c060b673eaf77428a099376baee740b3744174f68ec8a39","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1066.801","next":"us/40-cfr-1066.810"},"notice":"GroundRules: Original legal text. Not legal advice."}