Combined Fuel Economy Law and Legal Definition
According 40 CFR 600.002-85 [Title 40 Protection Of Environment; Chapter I Environmental Protection Agency; Subchapter Q Energy Policy; Part 600 Fuel Economy of Motor Vehicles; Subpart A Fuel Economy Regulations for 1977 and Later Model Year Automobiles General Provisions], Combined Fuel Economy means "the fuel economy value determined for a vehicle (or vehicles) by harmonically averaging the city and highway fuel economy values, weighted 0.55 and 0.45 respectively, for gasoline-fueled and diesel vehicles. For electric vehicles, the term means the equivalent petroleum-based fuel economy value as determined by the calculation procedure promulgated by the Secretary of Energy."
