Search by make for fuel efficient new and used cars and trucks 2021 Dodge Challenger SRT Widebody 8 cyl, 6.2 L, Automatic 8-spd Premium Gasoline: Chrysler definitely mentions not using fuel greater than 15% ethanol in non flex-fuel vehicles in the owners' manual. E-85 Usage In Non-Flex Fuel Vehicles. Non-Flex Fuel Vehicles (FFV) are compatible with gasoline containing up to 15% ethanol (E-15). Gasoline with higher ethanol content may void the New Vehicle Limited. Search by make for fuel efficient new and used cars and trucks 2014 Dodge Challenger SRT8 8 cyl, 6.4 L, Automatic 5-spd Premium Gasoline: Not Available. Luggage Volume. 16 ft 3 (2 door) Fuel Type. Regular Gasoline. Engine Descriptor. Transmission Descriptor. CMODE. Fuel Economy of the 2009 Dodge Challenger. Compare the gas mileage and greenhouse gas emissions of the 2009 Dodge Challenger side-by-side with other cars and trucks. 9xaeI.