[comptiger5000]

There's no E0 around here for me, and I don't think there's any up in Rochester, NY for when I go to college in the fall. There's E85 up there though.

I'm curious to know how much difference E0 vs E10 actually makes on my mpg, if I ever get the opportunity to test.

Then again, it's a Jeep, so its expected reactions are never what I get. Over on bobistheoilguy.com, they have a decent number of people agreeing that MMO or other UCL, if dosed properly can improve MPG very slightly and smooth out the engine. So, I tried it for a few tanks. Well, it did idle smoother and start a hair faster in the mornings, but my FE actually got slightly worse. I stopped using it a few weeks ago, although I'm not entirely sure on my FE afterwards yet, but it seems to have come back, maybe even a little better than before (maybe my injectors are cleaner?).