2007 Lexus GS 350 Owners Manual - Page 127

1-5. 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. n Fuel types Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number 96] or higher) n Fuel tank capacity Approximately 18.7 gal. (71 L, 15.6 Imp. gal.) n When the fuel filler door opener switch is inoperable If the fuel filler door opener switch is inoperable, contact your Lexus dealer to service the vehicle. If you must refuel your vehicle, you can open the fuel filler door manually as shown. The system to lower internal pressure may not be functioning so you must turn the cap slowly as the pressure releases. In addition, fuel may spill out during refueling. Fill the fuel tank carefully and slowly. 50