100oct vs E85
#3
Yes, I would go E85. That is what I am having my GTE lexus tuned for. Its about half the price of 100 octane..then again you use a little more E85..I think about 30% more..still works out being cheaper
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#8
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Usually on the pump it will tell you the minimum octane rating, here in Kansas it say's minimum rating of 105 octane and that is with the E70 blend for winter. I highly suggest to our customers that plan to run this that a wideband with a gauge is highly suggested as well as a tactrix cable to log their car. This way you can see the changes if tuned for one blend and then pumping in another.
If you tune on the E85 blend, and then pump in E70 the car will run richer due to less ethanol in the fuel. Other way around the car will run leaner. The logs will also tell you if you have any knock as well.
Other than this, another approach is an ethanol content gauge that another user of the forum had made. With the addition of a flex fuel sensor you have the ability to visually see how much ethanol content is in your fuel.
Hope this helps.
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Just switching from 100 octane or pumpgas to E85 with the same boost level and ignition timing, and only dialing in fuel to the desired afr; you'll make more power and torque accross the entire powerband and pick up spool.