Not Ranked
Be sure it is UN-leaded race fuel or you'll fry some FI sensors.I think the race fuel is masking the hesitation problem.
With a 9.5 to 1 motor,91 octane is sufficient to run the engine well.
There is also a formula to figure out the optimal octane for your combination,as too much octane is a not a good thing either.Then you can mix your gas to the correct level and it will be somewhat cheaper.
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