NOTE: This is not a drop in modification and will require tuning of the Engine Control Unit (ECU). This mod is not exclusive to E85 usage. I have been tuning my 2007 Mazda Miata MX5 (NC) with an open source software for a while. I enjoy tuning as it gives me another level of depth that I can add to my vehicle. I can control and manipulate values to make the vehicle behave any way I want. I decided to experiment with E85 fuel. E85 is readily available near me and is relatively