2013 Hyundai Sonata Owner's Manual - Page 9

Introduction FUEL REQUIREMENTS Your new vehicle is designed to use only unleaded fuel having a pump octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher. Your new vehicle is designed to obtain maximum performance with UNLEADED FUEL, as well as minimize exhaust emissions and spark plug fouling. WARNING • Do not "top off" after the nozzle automatically shuts off when refueling. • Tighten the cap until it clicks one time, otherwise the Malfunction Indicator Light " " will illuminate. • Always check that the fuel cap is installed securely to prevent fuel spillage in the event of an accident. CAUTION Never add any fuel system cleaning agents to the fuel tank other than what has been specified. (Consult an authorized HYUNDAI dealer for details.) Gasoline containing alcohol and methanol Gasohol, a mixture of gasoline and ethanol (also known as grain alcohol), and gasoline or gasohol containing methanol (also known as wood alcohol) are being marketed along with or instead of leaded or unleaded gasoline. Do not use gasohol containing more than 10% ethanol, and do not use gasoline or gasohol containing any methanol. Either of these fuels may cause drivability problems and damage to the fuel system. Discontinue using gasohol of any kind if drivability problems occur. Vehicle damage or drivability problems may not be covered by the manufacturer's warranty if they result from the use of: 1. Gasohol containing more than 10% ethanol. 2. Gasoline or gasohol containing methanol. 3. Leaded fuel or leaded gasohol. 1 3