Hmmm... okay, reading farther into Lazarus' wiki link, it is saying that post 1988 cars are generally okay with up to E-20, and post 1995 good with E-85. Now I'm wishing I'd read that in the first place.
Thanks, Lazarus!
I wish I were more thorough in reading all of this stuff in the first place: it would have saved me a couple of posts...