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Exactly right. The flex kits have a much wider range, you can literally run any combo of E85 and regular gas. Shiv's tune is only recommended down to E60.
But if you think about it, most E85 is close to E85. It does vary by area, but you probably are not going to typically see it below E75. That gives you a gallon or two in the tank still of regular gas (normally E10 + rest normal fuel) to fill up from regular to E85 and still be at E60+ for Shiv's tune. Flex kits are "a lot of spend for a little flexibility" IMHO. I'm not interested.
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