2011 Toyota Tundra CrewMax Owners Manual - Page 691

6-1. Specifications Fuel information Gasoline engine Your vehicle must use only unleaded gasoline. Select octane rating 87 (Research Octane Number 91) or higher. The use of unleaded fuel with an octane rating lower than 87 may result in engine knocking. Persistent knocking can lead to engine damage. At minimum, the gasoline you use should meet the specifications of ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada. Flex-fuel engine Your vehicle must use only unleaded gasoline, E85, or a blend of the two fuels. Unleaded gasoline (Octane rating 87 [Research Octane Number 91] or higher), E85, or a blend of these two fuels is required for optimum engine performance. The use of unleaded gasoline with an octane rating lower than 87 may result in engine knocking. Persistent knocking can lead to engine damage. The use of fuel with an ethanol concentration in excess of 85% will have a negative impact on driving performance and can cause damage to the fuel system components. At minimum, the gasoline you use should meet the specifications of ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada. At minimum, the E85 you use should meet the specifications of ASTM D5798 in the U.S.A. n Fuel tank opening for unleaded gasoline To help prevent incorrect fueling, your Toyota has a fuel tank opening that only accommodates the special nozzle on unleaded fuel pumps. 668