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Originally Posted by rfuerst911sc
Curious on your thoughts of running non-ethanol 89 octane vs. E10 93 octane ? As you stated any % of ethanol will have less BTU's then " straight " gas . So is non 89 close to E10 93 octane ? Will there be a noticeable difference in performance ? I know the knock sensors will kick in if needed but just curious on your thoughts . My gut tells me 89 octane non-ethanol may be the better choice .
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A best, the performance differences for four octane rating numbers is small, but still in the favor of the 93. If you are concerned about the corrosion potential from the ethanol, simply add something like StaBil when filling up, which will prevent the problem while stabilizing the fuel.