yeah... they're out there.. first time i saw one was in Okla.City.(stuck in traffic on I-44, noticed it down on the surface streets, Oh! didn't know they had stations...)
did a little research, and they're mostly independent mom & pop franchises, few-no corp. owned stores.
and just for comparison, around here
Reg $2.57 (+.30 for mid, +another .30 for prem) ALL E10
(until the Casey's opens fingers crossed, most of them in the surrounding area have E85, E15, and E0 91.)