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· Registered
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E85 varies a LOT. Summer blend can be 90+% and Winter can be little more than 50%. If you run E85, you need to check every batch. When you find a GOOD batch, buy it by the drum and store it in SEALED containers filled to the top... and stored out of the heat/direct sunlight.

If you don't do this... especially with a carb... the tune will drive you nuts.
I have ran e85 for years and have never seen that much variation. And I would not be chasing the tune for e70-e85.
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