@vickytulla @neodescorpio @eur0_2 ! Bhai Hi-Octane bera garq kar de ga aap k engine ka. Your valves will be worn out quicker. Hi-Octane fuel burns slower and is harder to ignite, and our bikes engines are not enough to keep-up with such a fuel ... which might start creating carbon deposits inside your combustion chamber. These are commuter bikes, and you should not use hi-octane unless the manufacturer says so.
"High compression" engines main use karne ka meaning "Piaggio" nahi, but those high-performance engines hain, say those heavy bikes with compression ratios higher than 12:1 ... which can use a fuel with octane rating 90 or higher. Otherwise 87 rating octane (normal Petrol) will do just fine.
Mechanics usually say to use Hi-Octane fuel, mixing it up with normal like 20% Hi-Octane, and 80% Petrol ... just to increase the efficiency of fuel burning a little bit. Practically, it'll have absolutely NO impact on your fuel mileage, because there is very little increase in octane rating but a significant increase in fuel costs. (tried and tested).
CG125 main to bilkul bhi na daalo Hi-Octane. Not even mixing Petrol up with Hi-Octane. It does more harm than any good.