Notheryote
Well-Known Member
The reason why they really emphasize zero or extremely little 93 being in the tank before logging the E85 tune is that it will throw off the short term fuel trims causing the logs to not be accurate compared to if you just had straight E85. As little as a few percent off and the stft will not be accurate, so even if you still only have one gallon of 93 I’m the tank and add 9 gallons of E85 the stft will be noticeably off and they can’t properly tune around that because that’s not an accurate representation of when you’d actually be on straight e85
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