I believe you can run up to a 30-35% mixture without tuning. Also keep in mind your fuel economy will drop by 20%. E85 runs alot richer than regular gas and therefore needs more of it so you'll be filling up more frequent. Honestly it's not worth the switch unless you have or are getting ready to do major up grades to the car. You'll have to replace injectors, pump and get tune. As far as cats go you don't have to replace them, most newer cats are designed to run on it anyway. Gas now has 10% Ethanol in it anyway.
Resident Grumpy Old Man(Keith)
03 WRX 2.0L
08' LGT Gears
Spec C goodies
Last edited by psinuse; 09-18-2011 at 08:56 PM.
Reason: stupid ergonomic keyboard...