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I am sticking to Shell V Power because it's ethanol-free. It's also slightly cheaper than Ultra 94. Shell takes Air Miles so there's cash back on top of the points I get with my credit card. Pretty sweet deal.
When I track, I will definitely fill with Ultra 94. I do feel more power and responsiveness with the higher octane. I can tolerate the possible negative effects of ethanol for one or two tanks of ethanol laced gas.
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