Highest Octane To Run My Yahmaha Yz250f

Nov 17, 2015
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I have e a yahmaha yz250ff and want to k kw without buying race fuel how can I get better gas than 92. Should I add boost additive or do you consider no ethanol 87 octane with some type of boost additive? I do dirt bike events up to 100 miles to just trails and dunes from 2-20 miles I do not race yet but it is still competitive and want the best out of my bike I can get and at the same time keep my engine safe. So for my style of riding what's the cheapest and best way to get the highest octane I can run?
 
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