What does your friend ride? Most bikes are designed and built for 87 octane gas. Don't waste your money on a higher octane, it won't make the bike work any better. You have to realize the GZ and other bikes similar to it are 3rd world bikes and will run on very poor grades of gas.
Your best bet is to buy from a major producer and stay away from mom an pop refineries that may not have all the proper additives. Better gas will contain Techron or something similar that keeps things clean.
Oh yeah, the clean bike look is good. Now go ride the wheels off.
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