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I agree with Jim that E85 is no replacement for race fuel mixing. However you could mix up some E50 - E40 by adding 93 pump gas to the E85. This wouldnt require the big carb mods that true 85% would require.

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So obviously it would be trial and error on the jetting.
BUT,,,, if you kept track of it like mixing 2-stroke gas it could work?
Also would one of those fueltesters be able to measure a lower blend, just like a nitro-car checks "the mix".
For someone like me with 6bbl.carbs. modifiying them for E-85 ain`t so simple.
Also I think quite a few guys just need some "insurance" to have a little more octane,but don`t need fullblown race gas or E-85.