Jim, One of the benefits of alcohol as a fuel is that it has a higher octane rating than standard pump gas. If the ECU is programmed to increase ignition timing when no detonation events occur then it will increase HP over using strait 87 octane gas. The 99+ Miata ECU does this to a limited extent. It is not uncommon for people to convert to E85 simply for the HP benefits, regardless of the overall increased consumption. I also own a 04 GTO, many people have converted to E85 use simply to get the extra 40-50 hp that the ECU provides by going into full advance ignition timing. Randy
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