TOYOTA 2011 Sienna - Manual (Page 195)

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1-5. Refueling
Closing the fuel tank cap
After refueling, turn the fuel tank
cap until you hear a click. Once
the cap is released, it will turn
slightly in the opposite direction.
Hang the fuel tank cap on the
back of the fuel filler door.
STEP 3
■ Fuel type
Use unleaded gasoline (Octane rating 87 [Research Octane Number 91] or
higher)
■ Fuel tank capacity (reference)
20.9 gal. (79 L, 17.4 Imp. gal.)