Last tank started at mileage 105843, and ended up at 106166. I filled up with 17.345 gallons, for a mileage of 18.622 mpg. NOT BAD! I have been driving... more gingerly. I don't really take it over 70 mph on the highway, for example.
E85 was $1.799 per gallon, regular was $1.99 and premium was $2.49 per gallon.
Compared to premium (E85 is 96 or 97 octane, and thus more similar to premium than regular), I saved $12.14 per tank.
Car is running fantastically on E85. Not one issue.