2NZE-FE works flawlessly on SGP, no need for Hi-Octane. Agar dil chah raha hay koi harj naheen. I tried that on my 1.6 tried various mix ratios, even two full tanks of pure Hi-Octane, did not feel much difference. Back to SGP.
PS: On normal petrol also it pushes me back into the seat, when I floor the gas pedal