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I don't think so on this forum, but should not be a problem. ECU doesn't know or care what fuel you are running. Set up the calibration table for the WB for E85, add 30% to your premium fuel map to start and tune frum there.
the rubber parts used in the miata fuel system would not survive long under the e85...
This was discussed on the HHO forum last winter.
Even the ethanol 10% blend shortens the life of the rubber parts of ur ride but not by that much to where you can blame it directly.
Been running e85 in my 99 for nearly 2 years... generally 70/30 mix of e85 : 93 and no problems. Has anyone reported issues with their Miata using e85 or is this sheer speculation?