Quote:
Originally Posted by hatton
Came across this thread while researching e85 mixes. Curious, is it Ill advised to run the e85+91 mix without a tune? All we've got up in Iowa around me is 91 octane as the highest and everyplace has e85. Was considering meth injection, gna test this out as sort of a midpoint so I hear.
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If you ran E85 without a proper tune you may exceed the fuel trims, depending how much you add. Putting in 3gallons of E85 per full tank will just clean up any timing correction you may have. Probably not worth the hassle.