Toyota Tacoma 2012 Owner's Manual page 76

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 21.1 gal. (80.0 L, 17.6 Imp. gal.)
When replacing the fuel tank
cap, turn it until a clicking sound
is heard.
After releasing your hand, the cap
will turn slightly to the opposite
direction.
1-5. Refueling
1
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