Flex fuel/ e50 tune questions

[Thraxbert]

Yeah, it won't matter.

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[JoshuaQ]

Gotcha, makes sense. I was assuming running way over what the car is tuned for without the supporting parts/tuning would lead to damage.

I guess the consensus is that a percent or two over e50 until you re-mix shouldn't be an issue right?

Consensus is a percent or two won't hurt, but it's recommended to upgrade pump if going e50 or above, especially for e85. That's what I've heard and read.