I filled up at Meijer this morning. Here are the stats:
Price E85: $3.66 a gallon
Price 87 Octane gas: $4.16 a gallon
Gallons E85: 5.520
Gallons 87 Octane: 9.208
Gallons left from tank #8 (@~31.809% ethanol): 1.672
I'm assuming that the E85 is 75% ethanol, 100 octane.
Ethanol content of tank #9: 34.102%
Octane of tank #9: 91.821
Tank 8 finished with a mileage of 26.4. Average speed was 39mph.
I tried to increase the ethanol content a little bit. We'll see what happens.