Bhai, during your Linea R&D , did you come across any feature which lets the ECU know what Octane the fuel is? ( In Petrol Lineas) I remember an episode of Fifth Gear UK, where they dyno tested different Octane numbers. They completely drained the fuel tank and reset the ECU when going from one Octane number to another. The car knew what Octane number it was running and altered it's performance on its own. Higher performance settings for higher octane, lesser for lower octane.