I filled up at Meijer on Saturday.
I decided to keep increasing the ethanol content, despite the CEL. I want to see if I can get LTFT over 25. If so, I'll keep going higher, if not I'll back off to something that doesn't light a CEL.
Gallons E85: 8.003
Gallons 87 octane: 5.571
Price E85: $3.05
Price 87 Octane: $3.54
Ethanol content of tank #20 (@ 74% ethanol in E85): 46.62%
I finished up tank #19 with 22.1 mpg at an average speed of 31 mph.