I've got 2.4L, as my car is a GT, so I don't have that option.
I have heard from others (driving other vehicles) that E85 just isn't worth it. Your gas mileage will drop by an average 3-5 mpg (often more), and (especially now) the price difference between E85 and regular 87 octane isn't enough to make up the difference.
There is also a loss in performance associated with E85
good luck
Exco