Race fuel or AV gas???

K-rok

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I know that everyone has there opinions about which is the best fuel to run. Was just wondering....I have a "bone stock"supercharged Yamaha Nytro (zero engine mods)running 15-16 pounds of boost. Currently using straight VP C-111, but obviously it's getting a little pricey!!!! My question is.....can I SAFELY run a lower octane fuel? 50/50 AV gas and race fuel? Straight AV gas? AV gas and premium?? Do NOT want the engine to crater!! Riding at elevations from 4500-9000 feet. Any honest and truthful knowledge would be appreciated. Thx.
 
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