The Suzuki Gixxer 155 BS6 is designed to run on regular gasoline, typically with an octane rating of 91 or higher. Power petrol or high-octane petrol is not required or recommended for the Gixxer 155 BS6. Using power petrol in a bike that does not specifically require it may not provide any significant benefits and could potentially lead to issues in the future.
Using a higher octane fuel than required by the engine does not directly relate to the bike's cubic capacity (CC). Octane rating primarily determines the fuel's resistance to knocking or pre-ignition. Higher-performance engines with higher compression ratios may require higher octane fuels to prevent knocking, but this is not the case for the Gixxer 155 BS6.
Using power petrol unnecessarily can be more expensive and may not deliver any noticeable performance improvements or benefits. It is generally recommended to follow the manufacturer's guidelines and use the appropriate fuel as mentioned in the bike's manual or by the manufacturer. Regular gasoline with the recommended octane rating should work perfectly fine for the Gixxer 155 BS6 without any problems in the future.