25% ethanol in my Z since June 2010. For over 2 years now I've been using E85 with my flex fuel tune from SZ. In my opinion you will need new injectors at some time no matter what you do. I wouldn't waste my money on additives. Here is a post that is interesting: [ http://www.evolutionm.net/forums/e85-ethanol/570749-fuel-system-after-3-years-e85.html ] In my old '01 Infiniti QX4 I don't run premium, I run 20% ethanol instead. It has plenty of octane, runs better and is a lot cheaper to fill up.
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