Quote:
Originally Posted by MikeSVX
This is mostly true. You also have to have your ECU reprogrammed with different fuel maps. E85 has more oxygen molecules then standard gas. Because of this, you need to inject more fuel for the same volume of air. I have a friend who ran on E85 for a while and did the math. Running E85 worked out the same cost wise as running 89 octane in his car, however you get the benefit of better preformance. E85 is about the equivalent of 100 octane gas preformance wise. I had a supercharger kit added to my '94 Subaru SVX. We did a remap of the factory ECU and added a second set of maps for running E85. I haven't replaced the fuel lines so I don't run it, but all I need to do id replace them an run a 12Vdc power switch to the ECU to tell it what maps to use.
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For me, I got much worse mileage and the cost was far greater than using 91/93 octane because of this. Some states subsidize E85 so your results may vary
I'm assuming the next gen flex fuel vehicles will not have as big of a mileage drop as my 10 year old truck has!