Toyota Prius V 2012 Quick Reference Manual page 146

1-6. Refueling
Closing the fuel tank cap
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Fuel types
Use unleaded gasoline. (Octane rating 87 [Research Octane Number 91] or
higher)
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Fuel tank capacity
Approximately 11.9 gal. (45 L, 9.9 Imp. gal.)
116
PRIUS v_U (OM47784U)
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.
I n f o r ma t i o n P r o v i d e d b y :