AFAIK, MN is one of those states (Classic and such) and it goes back to the nineties when the law was enacted. I called my reps many times about going all in ethanol. As did boat owners etc. Today you can find pure gas pumps stating the law, "For classic cars etc.". Don't know the penalty as I haven't got a ticket for filling up my older 150, cuz I don't drive it much these days. Probably a couple hunnerd bucks. We get the regs we deserve. And we deserve exactly what we are unaware of.