I've played with some blends earlier this year with the Stratus, March thru June. Here's a piece of my data, these tanks were all back to back. Most recent first, so some of the upward gain is also changing driving habits.
35.13 E0 mileage
30.06 E44 mileage
33.57 E24 mileage
32.28 E16 mileage
33.05 E10 mileage
30.73 E21 mileage
3 tanks E85 average for the Impala is 24.5, E10 is somewhere around 29, 15% loss due to E85. (I drove the Impala last weekend same route as my commute with Stratus it got 36.2 mpg via factory gauge).
I'll start blending again if E85 drops back down far enough, $0.30 isn't enough.
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