Should I run 93 octane?

NotGnu

NotGnu

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#1
As stated before, I don't know what tune was done to this Fist before I bought it.
It def. seems to run better on 93 octane.
Is this a thing?
 


XR650R

XR650R

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What he said. ^
Yes. If it was tuned, it was probably tuned for 93.
I use a 91 tune when I go out west.
 


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