You don't need hi octane fuel in oriel at all. In Pakistan people usually think hi octane is some magic petrol which will solve all problems in a car. The octane(Ron) value of petrol is simply the amount of compression it can withstand. Higher Ron means it can withstand higher compression.
Honda's R18 engine in oriel isn't a very high compression engine so it does not require hi octane fuel. It is always best to follow manufacturer recommendations when it comes to petrol. There is no point in going for a higher octane fuel than what the manual suggests, you'll just be wasting money on the higher priced petrol.