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My advice?
Forget about it.
MPG drops as E-levels rise.
I own a Fiesta ST. Done several tests on it.
Get 34mpg on 87oct, 33mpg on E12 (87+E15 in a 50/50 ratio), and 32.5 at E15.
All the while it gets better performance with E12.
The car recommended no more than E20. I ran E30 once, and immediately noticed a drop of a few (ten) HP.
In reality, it runs best on 87oct. But the added E15 cools the engine better, and compensates for the fiesta's rich burn.
Alas the mixture.
E85 will only run better with higher compression, or higher boost, and advanced timing, and still will get lower mpg, because Crapanol still has lower energy density than gasoline.
Thus, higher E values can get you better performance, but no better fuel economy. Think about it, lower energy density, and higher performance, there has to be a drawback. And the drawback is increased fuel consumption.
On a stock car, you'd have to bump compression from the default (10:1, or 11:1) to 14:1 when running plain E85, and use an engine heater block in cold climates.
Worst case, you can start the car spraying starting fluid in the air intake, until it's warm enough, usually about 5 seconds will do (more when the weather is colder)
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