I run it when I can in my work tahoe. Needs to be about 30% cheaper to break even. With a tune (maybe on newer models without) you WILL make more power. But at a loss of mpg.
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That is impossible. With 2 identical vehicles (other than one being flex fuel and the other not) with the same type of tune, compression, etc it is impossible for the E85 to make more power OR even get the same MPG on any road.
Its a scientific fact that E85 BTU output is 81,800 BTU/ Gal and regular unleaded (No ethanol) is 114,100 BTU/Gal and Regular Unleaded reformulated (E10) is 111,836 BTU/Gal.
There is just no way possible to get more energy out of E85 vs. Regular unleaded or even "watered down" E10. All this translates to the fact that it costs more per mile to drive on E85 than regular unleaded at current U.S. prices. Why would you want to pay more to drive? Ethanol cant hurt cleaning out your injectors but thats about all its useful for unless you are into making farmers richer.
So you will use more E85 to drive the same distance that you would using regular unleaded. There is NO magic in a flex fuel vehicle PCM. It has a flex fuel lookup table for fuel injection control which allows MORE fuel to the cylinders when using E85. Hell the flex fuel vehicles (5.3L) use the 6.0L higher flowing injectors because the standard 5.3L injectors wont flow enough fuel for engine demand when using E85.
Anyone tells you anything else is either a farmer selling corn or just completely FOS and in denial.
E85 is perfect for higher compression engines because its octane rating is high enough to prevent detonation. And as we all know octane rating HAS NOTHING to do with HP output.