{"data":{"id":"us/40-cfr-1065.725","jurisdiction":"us","citation":"40 CFR 1065.725","heading":"High-level ethanol-gasoline blends.","body":"For testing vehicles capable of operating on a high-level ethanol-gasoline blend, create a test fuel as follows:\n(a) Add ethanol to an E10 fuel meeting the specifications described in § 1065.710 until the ethanol content of the blended fuel is between 80 and 83 volume %.\n(b) You may alternatively add ethanol to a gasoline base fuel with no ethanol if you can demonstrate that such a base fuel blended with the proper amount of ethanol would meet all the specifications for E10 test fuel described in § 1065.710, other than the ethanol content.\n(c) The ethanol used for blending must be either denatured fuel ethanol meeting the specifications in 40 CFR 1090.270, or fuel-grade ethanol with no denaturant. Account for the volume of any denaturant when calculating volumetric percentages.\n(d) The blended test fuel must have a dry vapor pressure equivalent between 41.5 and 45.1 kPa (6.0 and 6.5 psi) when measured using the procedure specified in § 1065.710. You may add commercial grade butane as needed to meet this specification.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1065—ENGINE-TESTING PROCEDURES","Subpart H—Engine Fluids, Test Fuels, Analytical Gases and Other Calibration Standards"],"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":"04e04eadf759da4d069c68f97225de2abb40a1fd2d85f24ea1b291d9d702aee6","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1065.720","next":"us/40-cfr-1065.735"},"notice":"GroundRules: Original legal text. Not legal advice."}