Hi Octane 98 has a RON of 98, and is a special blend of unleaded petrol designed to bring high octane performance to unleaded cars with a high octane requirement, and may give better fuel consumption for you.
Check if you need to use Hi Octane 98 for your car.
(You should always use the octane rating specified by the vehicle manufacturer. Your car’s manufacturer may say that your vehicle will run better on higher octane fuel. If your vehicle needs high octane fuel, using a lower grade of fuel may make the engine run poorly and may even damage the engine and emission control systems over time, and it might void your warranty.)