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The most cost effective way would be to trade it in on a flex fuel ready vehicle.
Unless... Your fuel injection system will need to be able to handle about 30% fuel flow increase to run normally. This will necessitate a new fuel and ignition curve. In order to start playing with these things, the existing computer will need to be replaced, as the current O2 sensor will not read correctly to compute lambda and the ignition will need to operate with a different curve. The O2 sensor is not going to supply the correct voltage signal to the computer when running E85. The computer will force a lean burn that is off the permissible mixture range for running the engine with this percentage of Ethanol. E85 lean burn works up to an 11:1 A/F ratio for simplicity in describing this.
To describe the effect, if your car gets 30 mpg, it will now get 20 mpg once it's tuned correctly. That's kind of a raw way to look at it.
If you want to keep the Aspire and have vehicle emissions testing to contend with, forget you heard about E85.
If your planning to become a mad scientist, and can get around the emissions issues, then you will need to re-write the cars control system. Allow for lot's of down time and testing.
Only you can determine if that's worth your time and effort.
CJ
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