Well, it took me 2 hours to get home and an hour and a half to get back to work this morning, because of all the flooding and closed roads. So I decided to fill up so I don't get caught in traffic and run out of gas.
Gallons E85: 6.997
Gallons E10: 4.414
Gallons from last tank (@ 31.39% ethanol): 4.989
Ethanol content of tank: 42.81% (assuming E85 was 74% ethanol). Could be as high as 47.65% if it was 83% ethanol.
I was getting some funky STFT before I filled up. I saw -15! Kind of indicates that tank 17 was really low in ethanol.
I just ran up to O'Hare, and STFT looked much better. LTFT was around 17 or so.