I called the Chevrolet Customer Assistance Center (800-222-1020), and the answer was...
NO
the stock 2012 Camaro can NOT use E85.
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2012 1LT RS SW
15MAR12 purchased
22MAR12 Custom stripe install
25APR12 Installed CAI intake / ADM scoop / Roto-Fab windshield washer relocation
02MAY12 Installed RX Catch Can
...MORE TO FOLLOW
"Life's full of ironies, if you're stupid." -- P.J. O'Rourke