One of the reasons behind mixing E-85 with 91-93 is to increase the Octane. That's only needed if you have a Tuner (JB4) and you are adding boost to the engine. The more boost, the more Octane you need. If you are stock I would not mess with E-85, it will do you no good. With that said, blending the two can be tricky on these platforms. Most shoot for E-30 which is roughly 4gals E-85 to 12gals 93. Anymore and the High Pressure FP crashes. These platforms were not made to run Ethanol.