E85, if im not mistaken, is supposed to be 85% methanol and 15% gasolene. Since methanol is VERY high octain fuel, when you diloute it with a 15% mixture of gas, it shoudl still be WAY up there in octain. You should be able to run 10 to 1 easily I would think. As you stated, its a tractor and not a drag car but I used methanol in my supercharged drag car that had static compression of 11 to one and at full boost the compression ratio went up to near 30 to 1. So E85 should handle lots of compression and pressure.
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