2011 Toyota Prius Owners Manual - Page 134

1-6. Refueling Closing the fuel tank cap After refueling, turn the fuel tank cap clockwise until you hear a click. The cap will revolve slightly in the opposite direction once released. 1 Before driving n Fuel types Use unleaded gasoline. (Octane Rating 87 [Research Octane Number 91] or higher) n Fuel tank capacity Approximately 11.9 gal. (45 L, 9.9 Imp. gal.) 107 PRIUS_U (OM47685U) DVD