Toyota GT86 Owner's Manual page 88

1-5. Refueling
STEP 3
Closing the fuel tank cap

Fuel types
EU area:
Unleaded gasoline confirming to European standard EN228, Research
Octane Number of 98 or higher
Except EU area:
Unleaded gasoline, Research Octane Number of 98 or higher
If unleaded gasoline with an octane rating of 98 RON is not available,
unleaded gasoline with an octane rating of 95 RON may be used with no
detriment to engine durability or driveability.

Use of ethanol blended gasoline in a gasoline engine
Toyota allows the use of ethanol blended gasoline where the ethanol content
is up to 10%. Make sure that the ethanol blended gasoline to be used has a
Research Octane Number that follows the above.
88
Hang the fuel tank cap on the
back of the fuel filler door.
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.