This morning. OKC. E15 88 is about $0.15 cheaper than E10 87. My Mustang and DSM both run on E85 all year around. That is less than $3/gall. Around $2.79/gall last time I filled up. The no ETH kstuff is probably up there. I don't even look at that.
Ironically, Costco in Augusta, GA, was $4.39 for 93 last week and $4.09 today. Tomorrow, the GA gas tax suspension is supposed to be lifted, so I'm expecting my next tankful to cost a little more.