The following links can be found in the Wiki.
Motor Trend: "The SS manual trails by a mere tenth, but from there its added 26 ponies pull it ahead, tripping the quarter-mile lights in just
13 sec flat at 111 mph."
Car & Driver: "With the six-speed automatic, the Camaro SS can hit 60 mph in a scant 4.6 seconds, with the quarter-mile arriving in
13.1 at 109 mph."
Road & Track: "With 426 bhp and a 3860-lb. curb weight, the car hits 60 mph in 4.6 seconds and the quarter-mile in
13.0 at 111.1 mph."
Popular Mechanics: "We hit 100 mph in 10.74 seconds and the quarter-mile was dispatched in
13.02 seconds at 111.43 mph."
We were averaging 13.0 in our initial reviews and improved from there. I am struggling to find anything citing as low as 12.8. It is fair to give the Mustang the upper hand by up to .2 for now. This is a close race.