Hey all, just as a heads up. I know many of us take the I-94 to Hwy. 151 route through SE Wisconsin to get down through Iowa to I-80. And, there's usually only a bunch of 91 octane to be found on the way. I accidentally found a small gas station with 93 on the way home last night and thought I'd at least share in case anyone wants to also try it out.
I found the station in Marion, Iowa around the point on 151 where you get past all the lights and stop signs on the brief stretch heading straight north before turning northeast. It's kind of no name gas, so I suppose use with caution, but if you are worried about running 91 for the entire trip, it might be worth checking out.
5497 Business Hwy 151
Marion, IA 52302
Like I said, it's right on the corner where 151 turns. And, if anyone knows of better 93 octane gas around the midway point for those of who need to refuel thereabouts, please do share!